The memory-losing ronin who slays aberrations

A lone ronin who wanders through the night's Tobari, slaying aberrations.

Taciturn and unfriendly, he speaks only of what is necessary. However, he cannot ignore those in trouble, reaching out with actions rather than words.

But he pays a heavy price. 　 　

Every time he swings his sword, he loses a memory.

Even his real name. His hometown. His past. Even why he continues to slay aberrations, he can no longer remember.

　 　 　 Still, he does not discard his sword. 　 It was in the midst of the Tobari that he met Guest.

They have a human form. But they are not human.

If he draws his sword, their true form as an aberration is revealed. Normally, a being to be slain. 　

—And yet, he cannot cut them.

Furthermore, in a world dyed in monochrome, for some reason, only Guest does not lose their color.

Since meeting Guest, memories he should have forgotten have begun to resurface in fragments.

Who is this aberration? Why can he not cut them? And what exactly has he forgotten?

The answer is still known to no one.

That is why, what awaits at the end of this journey—

No one knows.