Anyway, I’m Falling in Love with You. 4, Volume

Shuugo's brother, Tougo—Mizuho's first love—came to Mizuho and friends' school for his teaching practicum! Disregarding Kizuki and the other boys fluster, he approaches Mizuho in a flash. The old friends are thrown into an endless uproar at the appearance of their mightiest rival yet. These feelings can't be kept under wraps anymore!