If you're looking for manga similar to Mashiroiro Symphony, you might like these titles.
Coming to earth to live the high-school life he's always dreamt of, Hirito finds himself in a bathroom on top of a naked girl! It turns out she goes to the world renowned Konoeghara Academy. Hirito is shocked to find the school only consists of seven students in total! Why in the world does the one of the most prestigious academies in the nation only consist of seven pupils...?
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Both of these are adapted from visual novels. Love blossoms between a girl and a male transfer student quite quickly in a similar way. As the pair becomes closer, they must band together, alongside their friends, to overcome an identical conflict and protect what's precious to them.
In order to protect the girl Yuuhi Katagiri, a new transfer student, from danger, Junichi Nagase is forced to kiss her. Not understanding what just happened, she yells at him, not knowing that her father has arranged for her to marry him.
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Both are based in visual novels. In both, a different route than the anime are taken, therefore, the main character develop romantic feelings for a different female character.
The story is once again set in Seio Girl's School, the location of the first game and its spin offs. A beautiful, silver-haired student named Chihaya Kisakinomiya is transferring into the all-female student body at Seio. The catch is that Chihaya is a boy.
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...
After a series of unfortunate events, the young Hirose Takuma was rendered blind. In an attempt to reverse his condition Hirose moves in with his uncle in a rural village, and upon his arrival he quickly begins to make new friends. However, Hirose soon discovers that one of his classmates, Hayami Kohinata, is being harshly bullied by her peers for reasons that neither she nor anyone else wants to explain. Even the seemingly honest and gentle Hinata Kagura, who had been doing her best to be friendly and helpful to Hirose since his arrival, acts harshly towards Hayami. Once a mysterious girl bequeaths Hirose with a life-changing gift, he takes it upon himself to help save Kohinata from her loneliness while working to uncover the truth of the situation.