Wピンチ!!

Arisa Kawai, a timid 14-year-old middle school student, often faces bullying at school due to her shy nature. Her life changes when Akina Yashiro, a transfer student and one of her former victims from her childhood days as a bully, arrives seeking revenge. When faced with danger, Arisa transforms into her former self, Alisa, a bold and aggressive personality who takes control and fights back. This split personality causes chaos as Arisa navigates school life and new challenges brought by Akina’s presence. The arrival of other characters, like the mysterious Hyakuta and Juri, adds tension as they also target Arisa for past wrongs. (Unreviewed summary by Grok 3)