The Moon is Watching

Their encounter was one summer day. It was at a tennis court where Natsu had gone with her younger sister Aki and their tutor, Kohei. Toru was fast asleep in the grass beside the tennis court. But Aki had beaten Natsu to success, and her love for Toru was unrequited. So whenever Toru came to visit, she would treat him to homemade cheesecake to try and win him over. But... what was she going to accomplish by doing that? Was she going to sever the bond between her and her sister and steal him away? "Just get over your feelings already," Kohei's words were a little hard to hear. And then, they won a trip to a hot spring resort for the four of them...?