How could Yotsuba Maya, the current head of the Yotsuba clan of magicians, spellswords, assassins, industrial, technological and industrial tycoons in the Irregular at Magic High School  and her twin sister, Yotsuba Miya, give birth to the protagonist of the Irregular at Magic High School, Shiba Tatsuya [Maya is Tatsuya’s mother], with Shiba Miyuki, Tatsuya’s younger sister and heiress of the Yotsuba clan being born a year later [Miya is still Miyuki’s mother] and Shibata Mizuki being born two years after Tatsuya [Maya is Mizuki’s mother], with Kitayama Shizuku, the heiress of the Kitayama clan, being born five years after Tatsuya, [Miya is Shizuku's mother] in the world of the Irregular at Magic High School? The shared father of Tatsuya, Miyuki, Mizuki and Shizuku is the current heir of the Shiba clan which dominates technology and mass media, Shiba Tatsurou from the world of the Irregular at Magic High School? Did Tatsurou take both Miya and Maya as his wives or something while having Miya as his public wife?

Could Mizuki having the ability to see spirits to the point where she can differentiate between the various types of spirits, forcing her to wear glasses in order to see normally and also to hide this powerful ability be a result of the mixture of Yotsuba and Shiba blood inside her? 

And why is Mizuki’s surname Shibata instead of Shiba? Any particular reason for this?

And since we learn that Tatsurou had a mistress who later became his second public wife after Miya's death, the researcher Furuha Sayuri from the Irregular at Magic High School, the series implies that Mitsui Honoka from the Irregular at Magic High School, the current heiress of the supposedly extinct Mitsui clan of light manipulating magicians is in fact Tatsurou's and Sayuri's daughter, with Sayuri in fact being a Mitsui but not having the magical power to use light manipulation, which her daughter Honoka, does have, albiet highly enhanced by the Shiba blood inside her [Honoka], how did Tatsurou cheat on both Miya and Maya long enough for Honoka to be born four years after Tatsuya, without either Maya or Miya ever knowing and why doesn't Maya hold Tatsurou accountable for this in the present? 

Doing a short crossover with Symphogear here, explain how Symphogear's protagonist Tachibana Hibiki is in fact Honoka trying to pretend to be a normal girl with her best friend, Koihina Miku from Symphogear, in fact being Miyuki in disguise. 


Also crossing over with the Onii-chan, Asa made Zutto Gyutte Shite! [Big Brother, Keep Hugging Me Tight Until Morning Comes!] Visual novel and hentai series, explain how the male protagonist of Onii-chan, Asa made Zutto Gyutte Shite! is in fact Tatsuya, with the surname Onami in fact being an alias Tatsurou and Miya both adopted to live as normal people in a middle class neighbourhood and the oldest of the protagonist's of the Onii-chan, Asa made Zutto Gyutte Shite!'s sisters, Sora, in fact being Honoka, the second oldest, Kohaku being in fact Mizuki, the third oldest, Akane In fact being Mizuki and the youngest, Sumi, in fact being Shizuku with the experiments done by the elder Onamis upon the protagonist of chan, Asa made Zutto Gyutte Shite! in order to improve his health when he was younger due to him being a sickly child in fact being done to stablize and boost Tatsuya's magical power with each of the sisters hugging him being a means of allowing Tatsuya to feel normal bonds.