As Rei Kurushima tries to hide her secret obsession with cute things, the world of The Unimpressive Chutaro is infected by the virus. Venturing inside Chutaro's world with Izumi and Minami, Rei discovers that the virus has turned all the cute animals hostile and becomes separated from the others. Rei soon comes across Chutaro himself and becomes unable to contain her fondness for cute things, which Izumi soon discovers...