Read manga “Hope You’re Happy, Lemon” at website Mangago
Summary:
“I’ve been cheating on you. Oh, and it’s not just one guy. It’s three. Sorry about that.” Back in middle school, Akiyoshi Sunao’s first-ever girlfriend shattered his heart, and he swore off love. However, all that changes when he develops a crush on a girl in his university’s film club. Just as he’s finally beginning to move on from the past, he bumps into his ex-girlfriend. Little does he know that this is only the beginning… To his horror, he wakes up in her body the next morning!
Alternative:
Hope You’re Happy, Lemon, Kuso Onna ni Sachiare, クソ女に幸あれ
Thank you, and have a great day!