If you're looking for manga similar to Marriage Battle!, you might like these titles.
Hanadera Keisuke is obsessed with yuri, and he's read all the Yuri Hime manga. However, he is sadly aware that there is one thing a lesbian romance absolutely does not need-- him. One day, a student named Akane transferred to his class from an all-girls school. She used to go to school with another classmate, Saori, and Akane immediately tried to pick up their friendship. However, her clinginess, desire for alone-time, and intensity all convinced Keisuke that he was finally seeing yuri in reality! Soon enough, Keisuke had stalked them enough to see a love triangle between Saori, newcomer Akane, and their standoffish classmate Matsuoka. Is there truth to his observations, or is he viewing the world through yuri-tinted glasses?
A high school story about the a love triangle between 2 girls and a boy. Fuuka likes Riri. Riri likes Itta. Itta likes Fuuka. This is not a typical love triangle, though!
Twin sisters Airi and Himari have always been very close, and worn identical hairstyles, clothing and accessories. But after they enter high school, Himari starts to drift away from her sister. When cornered by Airi, she explains that she has "a promise with senpai to fulfill," no matter what.
Two sets of friends come together to form a tight-knit group. Things become interesting when Nao spots Aoi's feelings for Chihiro.
A third-year junior high school girl wants to attend the high school that the senior student she yearns for attends. However, her grades are an obstacle. She goes on a tour of the school and inadvertently witnesses two girls kissing.
Tsukasa, Nadeshiko, and Mikage have been inseparable since they began junior high, but Tsukasa has a secret she’s been keeping from her best friends–she actually has a big crush on Nadeshiko! Not wanting to risk their friendship, she planned to keep it a secret forever, but when Tsukasa learns that Nadeshiko has a crush on Mikage, her desire to support her friends now conflicts with her own feelings. First love blossoms in unexpected ways for these three young women and their circle of friends.
Hoshigawa Kurumi has a crush her classmate, Nikaidou Nika, who sits in front of her in class. She's popular with guys, so she has no trouble going from boyfriend to boyfriend. One day, Nikaidou borrows an eraser from Hoshigawa.