“It’s hot…”Summer is just around the corner. Tokizaki Youichi’s air conditioner chose such a timing for it to broke down. It would take quiet a while to repair, so it seems, and as such he’s at his wits end. While he is at a loss for what to do, his childhood friend Misora Saku, who is staying in the next room over, makes an unexpected suggestion.She said, “You know what? Our room has a sliding door, right? If we open that door, it will be cooler, isn’t it?”Now that their rooms are connected, they are now aware of each other presences. What will happen to their relationship…?[Edited from Official Website]