Sora, who was raised by a strict father, has a precious older childhood friend named Tetsuya who lives in the house next to him. Tetsuya was always by his side, through good days and bad. As Sora grows up, their time together begins to change. And when Sora starts focusing on Tetsuya, Tetsuya realizes his desire for Sora... "I'm going to protect Sora. That's what I promised, but..." It's a bittersweet love story!