Rainbow Days, Vol. 4 (manga)

Four male friends support each other through the colourful 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! Is love in the air for Keiichi at last? A beautiful school nurse has captured Keiichi's heart.

But his older brother-a teacher at Keiichi's school-is fiercely against the match!