Four male friends support each other through the colorful ups and downs of teenage love.

These four friends couldn't be more different: Natsuki Hashiba, a dreamer who longs for love, Tomoya Matsunaga, a self-centered playboy, Keiichi Katakura, a winsome guy with a hidden saucy streak, and Tsuyoshi Naoe, a socially awkward nerd who loves anime, manga, and games. Together their high school days are as vibrant as rainbows!

Something is clearly bothering Keiichi as he listens to the others discuss their college plans. Can his friends help him out of his gloom? Graduation is almost here, but what does the future look like for the Rainbow Days gang?