Futakoi
A Jewel Case in Midsummer (1x7)
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Nozomu, the Ichijō twins, the Hinagiku twins, and Keisuke are invited to the Sakuratsuki mansion. After fishing and a barbecue, the group decide to play hide and seek. As Nozomu is trying to find a hiding spot, Yura and Kira let him inside the locked room because he is a special person to them. They confess their love to him and allow him to tell them what he feels about them later.