Manga Nijiiro Days

There's Na-chan, who gets bullied, and then there's Mattsun who's popular. There's also Megumi-chan, a sadist and Tsuyobon, 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?!