I Don't Know Which is Love manga volume 3 features story and art by Tamamushi Oku.

Mei Soraike may have entered college determined to find herself a girlfriend, but she never expected potential prospects to be throwing themselves at her like this! And if her tender heart being pulled every which direction wasn't enough, she's somehow gotten roped into taking a leading role in an upcoming play. She may not have any acting experience, but that's just fine—the script is mostly kiss scenes with Karin anyway! With time to rehearse running out, can Mei fake it till she makes it?!