Senkou Girl

Nanako has died.

Her beautiful absentee classmate, Tamiko Kisaragi, reappears at school like she's been born anew. The three girls she calls out are driven into a corner by her almost insane acts, but... What is Tamiko's true goal? Is it really vengeance? And what is the true identity of "the decomposing thing" in her house? This mystery unravels all kinds of girls' trouble including bullying, toxic parents, and humiliation...

(Source: Shogakukan, translated)