Kouki and Shiori are high school students who fall in love for the first time in April, amidst the dancing sakura. However, their experience with these new feelings is as tentative as the slightest breeze of the changing seasons. Even so, not a single day passes without being stirred by their first love. From the scenery they view inside the Ferris wheel to walking together through the rain on the streets—the red thread binding these two grows stronger as time goes on. This is the story of how they live through the first six months of their relationship.