Toki wo Kakeru Kaijuu(2022)

Toki wo Kakeru Kaijuu

Rando Shin, who lives in a Japan devastated by giant monsters, one day gained the ability to leap through time and transform into a humanoid monster. He decided to use that power to save his childhood friend, Azusa Nagi, who died in his past.

(Source: Sneaker Bunko, translated)