Hiiro, alongside his sister Rinne, is an ex-Agakura sniper.

As a legendary hero nears victory against a necromancer known as The Corpse God, things take an unexpected turn with the dark sorcerer’s final gambit—reincarnation magic. This last-ditch effort catches the brave fighter off guard, and now he’s a boy named Polka Shinoyama in a whole new world! The showdown between good and evil just got epic. 
 
(Source: Crunchyroll)

The second cour of Dead Mount Death Play.

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It's a showdown for the ages as the legendary hero takes on the corpse god necromancer, but when the dust settles, something isn't quite right... In the final moments of their epic confrontation, the corpse god's final gambit shot was wholly unexpected — reincarnation magic! Across space and time, a boy named Polka Shinoyama awakens feeling...not quite himself...... Who could've expected that the climactic battle between good and evil would turn out like this??
 
(Source: MangaUP!)
 
Note: Twentieth place of Tsugimanga 2020 Award in the Manga Category.

Hiiro Horojima