My Pretend Girlfriend

Noboru is a high school student who isn't at all popular. He looks up to senior student Miyazaki who is one of the school’s most popular guys. Miyazaki has two girlfriends: Momose and Tetsuko. They have totally different personalities. Momose is bright, and Tetsuko is a popular student from a wealthy family.
One day, Miyazaki is caught by Tetsuko while with Momose. To keep his relationship with Tetsuko, Miyazaki asks Noboru and Momose to pretend they are dating. They both agree due to their affection for Miyazaki. Noboru and Momose begin to act like a couple, and soon Noboru develops feelings for Momose, who is still in love with Miyazaki.