Shikimori seems like the perfect girlfriend: cute, fun to be around, sweet when she wants to be... but she has a cool dark side that comes out under the right circumstances. And her boyfriend Izumi loves to be around when that happens! It turns out that Shikimori-san came to troublemaker Hayase-san's rescue when they were in middle school! With Izumi-kun's help, Hayase-san sets out to make amends with the senpai she's long admired-but will she be able to tell Shikimori-san how she really feels?