More than a hundred years, one person, one knife.
Never give up.
That's the whole story.
The male protagonist is as follows, 1v1, no NP, no multiple endings, HE in the traditional sense.
The heroine is undoubtedly Zanpakuto Benihime, please be careful when eating.
The full name should be "Red Princess Ver. 3.0", Which is the last article in the Red Princess series.
Conception: