Tamaki, Shiina, Ayame and Minaha stay over at Shiina’s house to work on their new entry for the Summer Comiket, “Stardust Intenzione.” In the middle of the night, the doorbell sounds. Shiina opens the door to find Tamaki’s classmate, Natsu Iino. And Natsu has come to get her younger sister...?

It's summer, but the SNS Club is hard at work on their new game. At last, it's the day of the Summer Comiket, and the girls head for the hall to sell their new work, "Stardust Intenzione"!