Summer is just around the corner. Most girls from our SP group are about to graduate. Miyuki has just come in terms with her feelings for Shion. She wants to confess yet she's scared. Uknown to her, Shion shares the same thoughts. A cosplay party for the graduates will become their chance to break the walls between them.

Gravitation is a natural phenomenon where all things attract one another including stars, planets and galaxies. Three young girls are going to find out the real meaning of it after an encounter with three mysterious women. When the first dark clouds appear on the sky, their relationships will fall into chaos. The three girls soon will realise that everything was too good to be true