Ren Itsuki just wants to survive his first year of highschool without any drama but his exhausted routine gets completely derailed by Saki Haruka, a chaotic first-year student who manages to miss her train, faceplant in the schoolyard and speed past him in the hallway all in one day. When she drops her student ID and disappears, Ren is left holding her card and wondering whether this is just bad luck or the start of something new.