Hayasaka Akihito will be joining his sister Umi and childhood friend Yuika at San Francesca as one of the few boys tojoin the school since its conversion from an all girls to a co-ed school. One day, he threw a poor joke towards his sisterthat bothered her so much that she wouldn't even see him anymore. Trying to patch things up with his sister, Akihito decides to enlist the help of Umi's friends to try to sort the situation out. Unfortunately for him, this may wellbring back some unwanted memories from the past...
