Netoge no Yome ga Ninki Idol datta: Cool-kei no Kanojo wa Genjitsu demo Yome no Tsumori de Iru

Kazuto Ayanokouji is an ordinary high school boy. He spends his days playing online games as a hobby. One day, he discovers the true identity of a friend who is so close to him that they are married in-game. It turns out to be a cool idol from the same class, Rinka Mizuki. As Rinka tries to act as his wife in real life, Kazuto is forced to lead a dizzying life. (Source: Overlap, translated)