Picking up the day after the original series ends, this continuation follows Hachiman Hikigaya in short-form installments, narrated largely through his younger sister Komachi's eyes. It opens with Hachiman admitting to her that he is dating Yukino Yukinoshita, news Komachi meets with genuine happiness for him even as she quietly worries it will mean less time for the two of them. The Service Club's cast carries on from where volume fourteen left them.