Tajuu Jinkaku Kanojo

Also known as: 多重人格彼女, My Girlfriend has multiple personalities

by Homekorosuke, Funko

Narita doesn't believe in love at first sight, but when he meets a cute high school girl named Tsubasa, he falls for her immediately and even confesses to her. They both decide to start out as friends, but then she comes out and tells him the she has multiple personalities...!? (Source: Shonen Jump Plus, translated)