An oowakizashi made by Aoe School of Bicchuu. He was an ootachi that was then shortened into his current form. A sword famous for the legend of cutting an incorporeal ghost. Somehow, he's always shrouded in a mysterious aura.
Comments from Voice Actor
Q: Tell us your impression of the character you are acting as and what enthuses you most when you are acting him.
A: Nikkari-san... at any rate ends up being [erotic] huh (laughs). He gives the impression of always saying things with a deeper meaning behind them, but... I also get the feeling that he doesn't really get involved with the others in game, so I think it'll be nice to have a conversation with everyone in the anime.
Q: Tell us about any happenings around you lately that feels like "Hanamaru".
A: I got to fully enjoy summer. I went to a beer garden with my friends and went sightseeing(?) or something like that to Tokyo with my junior. Drinking beer when you are sweaty and your throat is parched is... Hanamaru!!