Girlfriend and Girlfriend, Her, and Also Her, Two-Timing Fair and Square, She is also my Girlfriend
Kanojo mo Kanojo
Right(→) to Left(←)
Manga Description

Secondary school kid Naoya gets an admission from Momi, a charming and benevolent young lady. Be that as it may, Naoya as of now has a sweetheart, Seki... be that as it may, Momi is too acceptable a catch to give up. Momi and Nagoya's objective turns out to be clear: persuade Seki to acknowledge being a thing with both of them. Will she move?