Nishichino

Nishizawa is a het ship between Kiriko Nishizawa and Sōsuke Ichino in the Danganronpa fandom.

Canon
At one point during the Student Council's killing game, Kiriko approached Sōsuke with a shovel, shouting she's going to kill him. In a heat moment of self-defense, Sōsuke is forced to kill her with a spear. He then begins to cry after what he's done, saying that he loved her. The circumstance makes it seem that Kiriko wasn't unaware of Sōsuke's feelings for her before the game.

It is likely that having just killed his crush has triggered Sōsuke to kill Tarō Kurosaki and Tsubasa Kamii seconds after.

Fanon
The ship isn't that well known due to appearing on screen only for a couple seconds.