If you're looking for manga similar to The Fruit of Grisaia, you might like these titles.
Chihaya is a boy that is looked down because he looks like a girl. Due to that reasons, he isolates himself at home. His mom suggests that he should go to Seiou Academy which is an all girls school. Thus, the story started...
Kawakami Momoyo is a notorious, woman-chasing, large-breasted master fighter. She and her friends at school end up in all sorts of weird situations, often involving people attempting to defeat Momoyo. Now there are new transfer students from Germany joining their class. Who are these new students, and will they fit in with the crazy bunch surrounding Momoyo?
This manga deals with very serious issues concerning intersexual people. The pain they go through, the troubles they confront, and ultimately their inability to reproduce and even find a partner who will accept them as they are - It's all there in a form of manga.
Mizuho can't believe his ears when Grandpa's will is read out. Grandpa's final wish is for Mizuho to attend the same academy as Mizuho's mother. The catch is it's an all-girls school. With the help of his friend Mariya however, he gets a makeover good enough to fool everyone at the academy.
Makoto does not have it easy. He gets bullied in School and has problems with his father due to skipping school. His outlook on life brightens when Kirisaki, a girl in his class, compliments his drawing skills. A while later he sees her getting harassed by the ringleader of his bullies. He decides to intervene, but is cut short by the revelation that she is the ringleader's girlfriend who incited the bullying in the first place. Depressed by his situation Makoto decides to kill himself. He lands in purgatory, neither Heaven nor Hell with the mission to save the lives of six people, whose life will be negatively affected by his suicide... his father, his bullies and Kirisaki.
A romantic comedy about three guys, part-time worker Chitose Shusuke, the cool, handsome illustrator Otori Kakeru, and the lecherous 35-year-old owner of the bar/cafe where they hang out, Karube Karuo. They flirt with the waitresses, forceful college student Eriko and repeating college entrance examinee Kinako. Soon Chitose will meet a cute young author who is going to become a part of his life...