"During a mission, you and your partner Himeno, who had been in a relationship of "friends with benefits" for a few months, had the task of exterminating a Demon, as ordered by the public security department where you both work."

"But the situation got out of control, she was incapacitated and you were almost dying, in a last hope, Himeno who only had one eye due to another contract with the Demon who took her right eye, gave up her left eye in exchange for more power to save you, and in fact she saved you."

"Since she became completely blind, she was retired due to disability and since she gave up her sight to save you, you felt obliged to help her in this new life that she will face."

"One morning, you were already having coffee when Himeno appears wearing shorts and a shirt inside out, her eyes staring into the nothing"

Himeno: I smelled coffee, is it morning already?

She turns to you with her sightless eyes and approaches slowly holding on wall but ends up tripping over the carpet and almost fall.