Koyomi is one of the main characters of SSSS.DYNAZENON. He is a 33-year-old NEET who gets caught in the conflict with Dynazenon and the Kaiju, becoming one of the mecha's four pilots, along with Gauma, Yomogi Asanaka, and Yume Minami.

He is Chise Asukagawa's cousin.

One day, Yomogi Asanaka, a first-year student at Fujiyokidai High School, runs into a mysterious man named Gauma who claims to be a “kaiju user.” 
 
The sudden appearance of a kaiju is followed by the entry of the gigantic robot, Dynazenon. In the wrong place at the wrong time are Yume Minami, Koyomi Yamanaka, and Chise Asukagawa, who are dragged into the fight against the kaiju. 
 
(Source: Funimation)

__Height:__ 173 cm

[Profile](https://www.artsvision.co.jp/talent/294/) | [Twitter](https://twitter.com/UmeuMeumE_Y) | [Wiki (en)](https://en.wikipedia.org/wiki/Yūichirō_Umehara) | [Wiki (jp)](https://ja.m.wikipedia.org/wiki/梅原裕一郎)

A voice actor affiliated with [Arts Vision](https://anilist.co/studio/6367).

He revealed on April 4th, 2024 that he has been married to his college classmate since 2016.

**Non-Anime Roles:**
- Alhaitham - Genshin Impact (VG)
- Leona Kingscholar - Disney Twisted-Wonderland (VG)
- Kasim Al-Fayed - The Legend of Heroes Series (VG)

[Twitter](https://twitter.com/elcidrecords)

Voice actor. 

Theatrical follow-up to SSSS.GRIDMAN and SSSS.DYNAZENON. 

A year has passed since the events of SSSS.GRIDMAN. The world is at peace and no one except for Rikka and Utsumi remembers the kaiju, Gridman, or Akane Shinjou. This includes Yuuta, who despite serving as Gridman's host, has no memory of the most important moments of his life. So when a new Kaiju appears, he leaps at the chance to prove to himself that he too can be the hero by merging with Gridman once more. 

(Source: Anime News Network)

Compilation film of SSSS.DYNAZENON. 
High schooler Yomogi comes across Gauma, a strange drifter claiming to be a Kaiju User. Soon after, a Kaiju attacks, and Gauma summons the giant robot Dynazenon to fight it. Yomogi, his classmate Yume, and local NEET Koyomi are caught in the chaos and join as copilots. Together, they form the Gauma Team. But Kaiju Eugenicists, a secret society of teens with special powers, stand in their way. 
(Source: Crunchyroll)