
If you're looking for manga similar to Joshikousei Nobunaga-chan!!, you might like these titles.
Hazumu is a shy and quiet boy who loves flowers and is forced to rely on his tomboy childhood friend Tomari as a bodyguard. Yasuna is the prettiest girl in school but she avoids men like the plague… until she meets Hazumu. Encouraged, he confesses his love; heartbroken, he heads for the mountains to be with his flowers. As if Hazumu’s troubles aren’t enough, his day is further ruined when an alien ship accidentally kills him. Luckily, alien technology exists that can revive him, but not without a price: Hazumu returns from the dead, but in the form of… a cute girl?!
A sloppily worn lab coat, lifeless eyes just like a dead fish's. He's the most un-teacher-like high school teacher, Sakata Ginpachi. The class he's in charge of, 3Z, is filled with 'intensive' students who have created a horrifying amusement park.
When I came down with a cold and was bedridden, a beautiful woman wearing cat ears appeared before me. But it turns out that she was actually my pet cat...?! She's usually calm, cool, and collected, but put cat ears on her and she's fawning all over me. How will my love with this mysterious beautiful woman turn out?
Eiji is a high schooler living with his father - a novelist who can't sell his works. Eiji is rather anti-social, nerdy, and worst of all, poor. But he is a kind, honest young man who never forgets how his deceased mother taught him to be compassionate towards others. He (along with everyone else) deeply admires his classmate Aoi-san, the daughter of the president of a large corporation. But Eiji had never been able to face her due to the enormous difference in their social standings. One day after school, he returns home to find that Aoi had come to visit him, and there, she says a few words that astonish him even more than he already is...