With Fireworks Comes Summer's End (E06)

Izumi-kun and Shikimori-san make plans to see a fireworks show together. As Izumi-kun is readying his yukata, his dad starts to tell him something with a serious expression. Then, on the day of the fireworks show, Izumi-kun sees Shikimori-san looking adorable in her yukata and tries his hardest to impress her... but his heroics are no match for Shikimori-san's. After they enjoy the festivities for a bit, Izumi-kun starts to lead Shikimori-san somewhere else... but then Shikimori-san's sandal strap breaks! (Crunchyroll)