As summer break winds down, Hachiman expectes the last few days to be relatively uneventful ... until Yui suddenly stops by his house with a request and Totsuka invites himself to hang out. Not only that, but he somehow finds himself at a fireworks festival with Yui -- and Yukino's sister. Whether Hachiman likes it or not, his relationships with Yui and Yukino are changing, and even this stubborn loner can't ignore it forever.

Original Japanese edition published by Shogakukan 2011.