Rengoku

is the sword of Counter Guardian Okita Souji Alter.
==Profile==
===Background===
The name "Purgatory" is something that was arbitrarily attached and originally it was an unsigned mysterious armament.Fate/Grand Order material VII Okita Souji (Alter) Translated by ComunCoutinho
During the Summer 2021 event, something in Okita Alter's summoning causes Rengoku to share a piece of her Saint Graph, giving it a humanoid form.
===Appearance===
:“The size of the sword form depends on the state of the Lord, so it has no predetermined values. What’s the sword form!? If anything, this humanoid puppet is the abnormality here.”
As a sword Rengoku has a deep, smooth, masculine voice. In humanoid form Rengoku's voice is high-pitched and childlike.
Simple Costume Dress Rengoku Alter.png| in Fate/Grand Order, illustrated by Takashi Takeuchi.
===Personality===
Rengoku's basic personality (though it’s a delicate matter to call it a personality) is a male sword, which is manifested in the short sword that they carry. Therefore, the original support voice was masculine, and had the gallant power of a pretty boy. … that’s how it should be, but Rengoku’s voice changed into an incredibly cute voice somehow, “How did this happen to me!?” 
It seems to be pleased with the purgatory name.
====Relationships====
;Oda Nobunaga (Swimsuit)
:"Swimsuit Nobbu, was she? Everybody forgets 'cause she acts and talks like an idiot, but she's quite dangerous in that state. It'll be despairingly troublesome when something really happens, so should I erase her now? …No? Ah, 'kay…"Fate/Grand Order Lines
;Oda Nobunaga
:"Demon King of the Sixth Heaven? For one thing, she's the first one to give me a name, and I'm thankful to her for lending me lots of mana when I activated for the first time. Well, that aside… Some day, she and my lord ──. No, let's stop. There's no point in getting worried now about something beyond help."
;Chacha
:"Chacha? Aaah! That person! She's always taking care of my lord! Wonder why. Strangely, my lord becomes stable whenever she's at that person's side. I don't really get it, but maybe it's because they're fellow humans? That's… a relation I don't really get."
;Okita Souji
:"The being who became my lord's origins, huh. Their beginnings were the same, but she's gone a reeeally different way, my lord. But… Roots, or rather, origins never change. It may not look like that at all, but how to say it… It's difficult to find a way to say it, but… "That" has been skipped. …Ah? You don't have to get it, really. Even if you knew, it's something that'd make you say "So what?"."
;Hijikata Toshizou
:"Hijikata Toshizou, hmm. It's strange how my lord's so attached to him. Might be 'cause he's a former acquaintance of my lord, though. I mean… I guess it kinda resembles my lord? His way of being."
;Sakamoto Ryouma
:"That guy with the crazy snake? We're on the same line of business or something like that, but to be strict I feel like we're different… Whatever, they don't look like they'd become my lord's enemies. ── In the first place, was that man really human?"
;Okada Izou
:"Oka, da… Who was that… Right! The guy they call Daaoka. Don't let that guy get too close to my lord, 'kay? Drop your guard and my lord will try to copy that guy's swordsmanship. In contrast to his appearance that's made up of high-level skills, so rather than not being suitable for my lord's swordsmanship, in my lord's case, she'll become weaker if she adopts that. Also, it'd be a pain if she catches his idiotness."
;Okita Souji Alter (Swimsuit)
:"My lord in a swimsuit? What's that actually? I didn't think I could become like that. …Huh? Cute? My lord aside, I'm not really happy about it or anything. My voice's also cute, you said? Eh, isn't my voice now cute too?
;Alter Servants
:"There are lots of Servants classified as Alters around you. So that's why my lord's been saying to call her Alter-chan. ...Well, if you feel like it call her like that, Alter-chan. Seriously, she extremely rarely says what she wants."
==Role==
===Fate/Grand Order===
====GUDAGUDA: Legend of the Imperial Capital Grail====
====All-Out Nobunaga Assault - GUDAGUDA Final Honnoji 2019====
====Summer 2021====
====GUDAGUDA Neo Yamataikoku====
==Abilities==
Rengoku is "a cool black katana." Somehow it is sentient and intelligent (to the point of being able to communicate on its own), its performance changing considerably according to the user's mood. When the user's condition is good, the center of the sword's blade shines with a crimson light. The size of the sword form depends on the state of the Lord, so it has no predetermined values. 
==Development==
===Creation and Conception===
Rengoku was illustrated by Takashi Takeuchi in Fate/Grand Order.
Rengoku first appeared as the sword of Devil Saber in Koha-Ace.
==References==
Category:Swords
Category:Characters in Fate/Grand Order (Part 2)
Category:Introduced in 2016
Category:Manifested by a Servant
Category:Paired Servants
Category:Chaotic Good Servants
Category:Servant equipment
Category:Voice - Yuuichi Nakamura