This is a visual novel-style simulation game about summer, sea breezes, and forbidden feelings.
You and your sibling Aoi Sorayui, who is somewhat clingy for some reason, come to the seaside town where your grandparents live to spend a month-long summer vacation. In this hot summer, as you spend time together intimately, some boundary-crossing feelings slowly grow between you.
Depending on your choices and interactions, your intimacy level will change, and you may even break through the forbidden boundary. The ending of this summer will be decided by you.
