This is the one that lowers your heart rate. Ten years of Nanamori Middle and the Amusement Club still runs on the same fuel: Kyouko freeloading in the old tea ceremony room, Yui being the only load-bearing adult in a room of children, Chinatsu aiming her affection at exactly the wrong person, and Akari being erased from her own opening. It's a comedy built on nothing happening with maximum commitment, where the biggest stakes are Sakurako and Himawari escalating an argument into physical assault or Chitose taking her glasses off and bleeding out over a daydream. An anniversary OVA is the ultimate low-spectacle flex: no arc, no growth, no reason, just the gang goofing off because the fans paid to see them one more time. Put it on when the world has been too loud and let Akari fail to be noticed for another twenty minutes.

Akari Akaza, Chinatsu Yoshikawa, Kyouko Toshinou, and Yui Funami reunite to mark a special occasion. After tossing around some strange ideas for how to celebrate, the four settle on throwing a party in their Amusement Club room. Friends from the Student Council lend a hand with the preparations, and the group also plans a surprise for someone special. Based on Namori's manga, this single-episode comedy keeps to lighthearted slice-of-life fun, with the girls' quirky personalities bouncing off one another as they get ready for the big day. The OVA was announced at an event marking ten years of the manga's serialization.