Timeline of Events

This page details when notable events take place in *Boku no Kokoro no Yabai Yatsu*. Pre-*BokuYaba* is any event that takes place before Chapter 1 of the manga, and *BokuYaba* is any event taking place on or after Chapter 1 chronologically. Many things, such a birth dates, are accurate within a year, due to not knowing the exact day of birth for many characters.

## Pre-*BokuYaba*

### **History:**

* The history of *BokuYaba* appears to be essentially identical to the real-world, centering around Japan. Events are assumed to be mostly identical excluding the goings-on of the main cast, up to 2019, where things divert slightly. For instance, there is no evidence of the Covid-19 outbreak occurring in the manga version of events.

### **1961:**

* Approximate birth year of Ichikawa's father.

### **1974:**

* Approximate birth year of Ichikawa's mother.

### **1979:**

* Approximate birth year of Yamada Sanae.

### **2000:**

* Approximate birth year of Ichikawa Kana.

### **2005/2006:**

* Most of Yamada and Ichikawa's classmates are born here. Notably, Yamada is born on Sunday, September 10th of 2005, and Ichikawa is born on Sunday, March 26th of 2006.

### **2014/2015**

* Ichikawa and Moe are in the same class both of these years. At some point, the events of Extra 85.1 occur here where Ichikawa tells off Hosaka, a friend of Moe's, for calling her a hag.
* Yamada is scouted for a modeling job while touring Shibuya with her mother, when she is in 4th grade.

### **2016:**

#### October:

* Ichikawa stays home during his school outdoors trip.

#### General:

* Ichikawa's flashback regarding the Smitch in Chapter 42/43 takes place here, when he is in Elementary Grade 5.
* Part of Extra 57.1, the flashback involving Ichikawa running into Yamada when a bunch of bullies try to steal Tadano's trading cards, takes place this year, as Ichikawa says he's in fifth grade.
* The events of *With Her Eyes Half-Open* occur here, as Chi is in class 5-1 at her school.

### **2017:**

* The events of Extra 71.1 takes place here, where Ichikawa wants a new backpack. Ichikawa is labeled as being in Grade 6. Also Yamada's first interactions with Serina.
* Chi participates in a basketball tournament that Yamada witnessed, due to it being a district-wide tournament.

### **2018:**

#### April:

* The flashback from Chapter 79 involving Chi and Yamada's first encounter at the basketball club is detailed here.
* Chapter One of the "Episode Zero" mini-novel takes place here, as Ichikawa says it's April at the beginning.
* The flashback from Chapter 103 involving the Sports Festival happens here.

#### October:

* Chapter Three of "Episode Zero" takes place here, as Ichikawa states that it's been six months since starting this school.

## *BokuYaba*

### **2019:**

#### June-September:

* Chapter 1 is set "around the end of June" according to a Q&A with mangaka Norio Sakurai.
* Chapter 2 takes place the day after Chapter 1, as Ichikawa says he lent Yamada his knife "yesterday."
* Chapter 5 takes place on a Sunday. Possible dates are listed in References.
* Chapter 6 takes place the morning after Chapter 5, as Ichikawa says he didn't sleep well last night due to the CiEL magazine.
* Extra 123.1 takes place after Chapter 8, on the same day, as Ichikawa connects Yamada wearing her school swimsuit under her clothes to his (false) belief that she isn't wearing underwear.
* Chapter 11 is the last time the kids wear Summer uniforms this year, meaning all previous Chapters must take place before October 1st, which is when Japan culturally switches from Summer to Winter uniforms. The next chapter has all of the kids in their PE uniforms, and so it is unknown when it falls on.

#### October-December:

* Chapter 13 is the first Chapter where the kids are in their Winter uniforms, meaning it must be on or after October 1st.
* Chapter 15 takes place one day after Chapter 14, as Yamada says to her two kouhai fans that she was hit by a basketball the day prior. The October portion of the timeline Extra shows a picture of a basketball as the associated image, implying Yamada hurting her nose occurs then.
* The timeline Extra shows a manga page and milk tea bottle in the November section, implying that is the month the trip to Akita Shoten occurs.
* Extra 38.1 takes place one week before Christmas Eve. A chalkboard shows that it is the 17th, a Tuesday.
* Chapter 42 takes place on the 18th of December, a Wednesday. In Chapter 43, he says after their falling out that he didn't go to the library yesterday, meaning the last time he went was two days prior.
* Chapter 43 and the first half of 44 take place on December 20th, a Friday, as shown on Yamada's phone when she is making Christmas Eve plans. The latter half of 44 takes place on Monday, December 23rd, also shown on a blackboard.
* Chapters 45, 46, 47, and 48 all take place on Christmas Eve, a Tuesday.
* Chapter 49 takes place on Thursday, December 26th, as Ichikawa opens the chapter by reminiscing about the Christmas Eve date, two days prior.
* Chapter 50 and the first half of Chapter 51 take place on Friday, December 27th, as Ichikawa said they were leaving for Akita "in the morning" the night prior, while on the phone with Yamada.
* The latter half of Chapter 51 takes place on Saturday, December 28th, while the Ichikawas head back to Tokyo since their trip was cut short by his injury.
* Chapter 52 takes place on Sunday, December 29th, as Kana opens the Chapter by saying they only got back home yesterday.
* Chapter 53 mostly takes place on December 31st, a Tuesday, as stated by Ichikawa at the start of the Chapter. Ichikawa wishes Yamada a Happy New Year near the end of the Chapter, but there's no evidence that the year has turned over yet, and the latest his phone shows is 11:45 PM.

### **2020:**

#### January:

* Chapter 54-56, all take place on January 1st, as it is the New Year's Shrine visit and ensuing events in the same day.
* Chapter 57 begins with Ichikawa saying that school starts back today, and back in Chapter 44, Yamada says that they have two weeks of Winter Break. As Winter Break started on Tuesday, the 24th, Chapter 57 must take place on either Monday, the 6th, or Tuesday, the 7th. Chapter 58 takes place on the same day.
* Chapter 60 starts with Ichikawa saying he broke his arm three weeks ago, putting it somewhere **close to** the 17th of January. It **cannot**, however, be **on** the 16th or 17th of January, because Ichikawa comments that it's supposed to snow the next day, and they might have a half-day off from school. January the 17th was a Friday, so his statement would make no sense otherwise, and they also go to school the day after that day, taking Thursday out of the equation.
* Chapter 61-64, as well as the part of Extra 64.1 where Ichikawa washes the jersey, all take place the day after Chapter 60.

#### February:

* Chapter 68's introduction is Moe declaring that there is "7 days, 13 hours, and 23 minutes until Valentine's Day." Thus making it 10:37 AM on February 6th, a Thursday.
* The latter two-thirds of Chapter 68, as well as Chapters 69 and 70 take place at Yamada's house the following Sunday, the 9th. Chapter 71 takes place on the same day, when Ichikawa is back at home and talking with his family. Of special note, Kana is now at least 20-years-old, as she can legally drink as of 71.
* The last few panels of Chapter 71 take place on Monday, the 10th.
* Chapters 72-74 all take place on Valentine's Day, a Friday.
* In Chapter 75, Adachi and Ichikawa have a discussion about how White Day is a month away, though in actuality it was a month away on Friday. As such, they are likely estimating the length, and it is the next week, anywhere from the 17th to the 21st, since they're back at school.
* Chapters 80 and 81 take place on a Sunday. Possible dates are listed in References.

#### March:

* Extra 89.1 details Ichikawa thinking over possible gift ideas for Yamada on White Day, and is titled "the night before," setting it on Friday the 13th. A single panel from Chapter 90 of Ichikawa, Kanzaki, and Adachi fretting about the holiday is also here.
* The latter half of Chapter 87 takes place on White Day, a Saturday, and the 14th. Chapters 88 and 89 take place on the same day.
* Chapter 90 takes place on Monday, the 16th, as stated in the opening panels.
* Chapter 91 and the beginning of 92 take place on Tuesday, March 24th. Kana starts 92 by stating that it is "1 day, 2 hours, and 36 minutes" until Kyoutarou's birthday, meaning it is 9:24 PM at that moment.
* The latter half of Chapter 92, all of 93, and most of 94 take place on Thursday, March 26th, Ichikawa's birthday.
* The last three pages of Chapter 94 take place on Friday, March 27th, as the clock has shown to have rolled over to 12:15 AM. Chapter 95 takes place on the same day.
* Chapter 96 mostly takes place on Saturday, March 28th, as Yamada stated that filming would start "the day after tomorrow" in Chapter 94, and she messages Ichikawa that they're starting to film.
* The last few panels of Chapter 96 take place "3 days later" on Tuesday, March 31st. A news report on Kataoka Ken's affair confirms the date.

#### April-May:

* Extra 93.1 has a text exchange between Ichikawa and Yamada talking about April Fool's Day, making it, of course, April 1st. Yamada also has on her shirt from the Kande Hotel they're staying at in the Extra.
* Chapter 97 starts some time after April 1st, then transfers to the next day. Most of 98 takes place on the same day.
* The last few pages of Chapter 98 likely takes place on the 5th of April, a Sunday, depending on when classes start back up. Ichikawa declares that Spring Break ends today, and that break traditionally lasts for two weeks. Most of Chapter 99 takes place on the same day.
* The last three pages of Chapter 99 take place the day after, making it Monday, April 6th. Chapter 100 takes place on the same day.
* Chapter 101 takes place on an undisclosed day, which continues until a few pages into Chapter 102, which takes place on the following day, until the last few pages, which takes place on the day after that.
* Chapter 103 starts with Moriya declaring that there is 19 days, 18 hours, and 23 minutes left until their last Middle School Sports Festival. Since April 6th was the last known date, this means that the earliest possible date for the Sports Festival is April 26th.
* Chapters 105 and 106 both take place on the same day, detailing the events of the Sports Festival. Note that Golden Week would mean that the date would not be on April 29th through May 5th.

#### June-July:

* Chapter 107 begins with Ichikawa realizing he forgot to switch to the summer outfit for school. Japan traditionally changes this on June 1st, which just happens to fall on a Monday.
* The school trip to Nara takes place on the 10th, 11th, and 12th of June, a Wednesday, Thursday, and Friday. 108 and 109 take place on the 10th with the Nara deer and bath events. 110 through 112 take place on the 11th with Ichikawa's confession at the Fushimi Inari Shrine. 113 takes place on the 12th with Yamada leaving early and Ichikawa meeting up with her for her confession that evening in the library. Extra 122.1 confirms the date of their Anniversary.
* Chapter 114 reasonably takes place on June 15th, a Monday, as it opens with Ichikawa waking up in denial of Yamada's confession as a dream, and then going to school after that weekend. Chapter 115 and the opening panels of 116 take place on the same day.
* Most of 116 takes place on June 16th, a Tuesday, as Yamada says that they can talk with her parents "tomorrow after school."
* Chapter 117 takes place at least a day after 116, and the events of the concert take place "a few days later," and covers Chapters 118-120.
* Chapter 121 takes place when the class first realizes Yamada's blonde hair, and, given the events of the concert, likely takes place after a weekend.
* Chapter 123 likely takes place on July 20th, a Monday, as that is when the standard time for Summer Break occurs in Japanese schools.
* Chapter 124 takes place "ten days since Summer Vacation started," making it July 31st, a Friday.

#### August:

* Chapter 125 opens with Ichikawa saying that it's been fourteen days since he and Yamada have seen each other. If the 19th is the last time, that would make it around the 2nd of August, a Sunday. Moe brings up that their planned retreat will start on the 13th, a Thursday, and last for four days.
* Chapter 126 takes place three days before 127, as a panel in said Chapter shows that Kana only has three days until the live show. This makes it fall on August the 9th, a Sunday.
* Chapter 127 takes place on August the 12th, a Wednesday, as a sign outside the venue shows. Chapter 128 takes place during the same evening.
* Chapters 129 through 132 all take place on August 13th, a Thursday, as Kana explains that their beach retreat begins the next day in the previous Chapter.
* Chapters 132 through 134 take place the next day, on August 14th, a Friday.

## References

* Ichikawa states that Yamada's birthday is listed as September 10th on her Instagram profile. Two Extras also celebrate her birthday.
* Ichikawa's birthday is March 26th, as stated in an Extra. The event itself is celebrated in Chapters 92-94.
* The age of all four parents are given in an Extra.
* Chapter 5 can reasonably take place on June 23rd/30th, July 7th/14th/21st/28th, August 4th/11th/18th/25th, and September 1st/8th/15th/22nd. Earlier dates are more likely to spread out the remaining Chapters until Chapter 13.
* Chapter 80 can reasonably take place on February 23rd, March 1st, or March 8th.