Netoge no Yome ga Ninki Idol datta

Kazuto Ayanokoji is a typical high school student who enjoys playing online games in his free time. One day, he learns the surprising truth about his in-game partner—someone he's virtually married to. That partner turns out to be Rinka Mizuki, a popular and cool idol from his own class. When Rinka begins treating him like her husband in real life, Kazuto suddenly finds himself caught up in a whirlwind of unexpected events.