According to publisher Playism,
Blade Chimera is a brand new original Metroidvania by Team Ladybug, the team behind the critically acclaimed 2D Metroidvanias Touhou Luna Nights, the Touhou Project fan game which has sold over 50,000 copies, and the Record of Lodoss War fan game Record of Lodoss War: Deedlit in Wonder Labyrinth.
Play as Shin, a Demon Hunter who has lost his memories and is now exploring the world together with his sword—the transformed Lumina demon Lux—recollecting memories about yourself, your missing wife, and skills you’ve forgotten.
Each time you recollect a lost skill, Lux changes form according to the will of her wielder, making Shin stronger and granting access to more areas of the world.