Other name: أيام قوس قزح, 虹色デイズ (水野美波), 虹色DAYS, 虹色时光, รักสุดใจคนวัยซ่า (Thai), Oh My God Days, Rainbow Days
Summary: From Chibi Manga: There's Na-chan, who gets bullied, and then there's Mattsun who's popular. There's also Kei-chan, a sadist and Tsuyopon, an anime otaku. The four's lives interweave during their school year, and that's the beginning of silly and thrilling stories of friendship and love. One Christmas Eve, the heartbroken Na-chan met someone in a Santa uniform?