Cool, friendly Mariya is the undisputed king of his year! But why does he always hang around with shy and painfully awkward "Mr. Mannequin" Nachi? Can these boys withstand the non-stop judgment of a school filled with jealous rivals and confused classmates? A New Season of Young Leaves follows every sweet high and lonely low in the growing relationship of unlikely best friends. How will the most popular guy in class deal when his wallflower confidant suddenly steals the social spotlight…and a beautiful girl's affection?

Bright and early one Monday morning, Shino Yuzuru asks Seryou Touji out on a lark when they run into each other at the school gate. Seryou, who's immensely popular, has the odd habit of going out with anyone who first asks him out at the beginning of the week, promptly dumping them at the end of it. "Anyone" apparently includes male upperclassmen like Shino – and as a boyfriend, Seryou is perfect – unfailingly thoughtful and kind. Shino, obviously, has no intention of being in a serious relationship with Seryou. It's not like it's actually love or anything like that. Right?