From Summer RainKouki and Shiori are high school students. The both of them will start to weave a story about their first love in the month of April, among the dancing sakura. Their inexperienced love will tremble among the slightest wind of the changing seasons. Throughout the twelve months, there will never be a day that passes by without a stir. The scenery that is viewed from inside the Ferris wheel, walking on the streets together through the rain. This is how these two that are tied together by a red thread, live their lives through the first six months.