If you're looking for manga similar to Yandere Meruko-chan wa Senpai ga Osuki, you might like these titles.
Tsukamoto is an average girl who, for no particular reason, is drawn to Okazaki-senpai. A girl who might as well have a sign above her head that says “I am in an abusive relationship.”
Includes the following chapters:
Hagiwara Yuu has been holding the secret she likes girls from everyone and then she decides to take a chance on Nomura Chihiro.
Includes the following chapters:
Under the rain, Fujiwara Kito fell in love at first sight. From this moment she pursues her senpai, Tachibana Arise, throughout their all-girls school.
Mako gets caught in a sudden cold rainfall with her senpai. She invites the girl home with her to dry off.
Although they don't know each other very well, Hikaru suddenly confesses to Sakura, and they become a couple...
A world where humans and demons coexist. Shurika, a zombie, enters a boarding school where she learns to hunt “wild beasts”, a threat common to both races. There, she has to live for three years with a partner of a different race, and her partner is Marie, a holy knight who has great compatibility with zombies. But for some reason, Marie's love is strangely heavy...?