A second-year student with a severe case of eighth-grade syndrome, giving him delusions of grandeur and making him believe he lives in a fantasy world. Though usually cheerful, he has a hard time dealing with negative situations and often gets sad or even starts crying if something bad happens.

Seri Koyuki is just trying to have a normal school life, but instead he ends up acting as the straight man to his odd classmate, Kabuto Hanadori. Kabuto is a delusional high school student, whose fantasies range from believing he is a knight on a journey, to claiming that removing his eyepatch will release a darker alter-ego who he refers to as Michael Offenbarung Dunkelheit. Seri is determined not to let himself get pushed around by Kabuto, but it seems that this will be easier said than done!

__Height:__ 177 cm (5'9.75")

On October 26, 2022, it was reported that Sakurai had been engaging in an extramarital affair with a writer of his *P.S. Genki Desu. Takahiro* radio program. A month prior, it was publicly disclosed that he had been married to a former voice actress for nearly 20 years, although the writer had allegedly not been aware of his marriage as they had been in a relationship for 10 years and intending to marry. His previously announced roles as [Haruaki Karuma](https://anilist.co/character/290233) in [AYAKA](https://anilist.co/anime/155982/AYAKA/) and [Kusuriuri](https://anilist.co/character/2865) in [Mononoke (Movie)](https://anilist.co/anime/151117/Mononoke-Movie/) had been recast as a result.

On March 31, 2023, it was jointly announced with his talent agency "Intention" that they are ending their contract, as Sakurai requested to leave as a way of taking sole responsibility of his actions and for self-reflection.

Non-Anime Roles:
-Passenger in "Arknights" (VG/Mobile) (Japanese)
-Su in "Honkai Impact 3rd" (VG) (Japanese)
-Cloud Strife in "FINAL FANTASY 7 REMAKE" (Japanese)
Crow Armbrust - The Legend of Heroes Series (VG)

Seri Koyuki is a high school student who tries to avoid strange people because he knows he will just end up being the straight man to their antics. Enter Kabuto Hanadori, Koyuki's classmate who has chūnibyō (second-year middle school syndrome) and claims his eyepatch seals his god of destruction alter ego. Everything about Hanadori exudes the need for a straight man to keep him in check, and sure enough Koyuki is drawn in.
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<i>Note: Includes 5 extra chapters.</i>