Ame wo Tsugeru Hyouryuu Danchi

Kou and Natsume, two childhood friends living in the same apartment complex, spend their summer vacation playing around their building before it is scheduled for demolition. They become trapped in an unusual situation, suddenly finding themselves surrounded by an endless ocean. They must deal with this strange circumstance and try to return to their normal lives. The experience becomes a series of farewells as they face the end of their time together.