Kotonoha Katsura

, 桂言葉

A girl from class 1-4 is described as shy and quiet. she has a striking appearance that makes her uncomfortable around boys. despite being disliked by girls in her class and kept at a distance by boys, she becomes interested in makoto when he confesses his feelings with the help of sekais mediation.

Spoilers:

She is the one who kills Sekai after learning about the Sekais involvement in Makotos murder. After exacting her "vengeance", she cuts open her stomach to see if she was lying about being pregnant with Makotos child, where it is revealed that Sekai was not actually pregnant.She is finally seen on a boat, holding Makotos head in her arms, finally "united" with the man she loves. At the end of the manga, she has been stabbed by Sekai, but the situation was not shown. It was only told by Kokoro through the phone that her sister is bleeding a lot and Sekai gave herself away by smirking in front of Makoto.