If you're looking for anime similar to Onii-chan wa Oyome-sama! (Light Novel), you might like these titles.
Mira Munakata is a typical high school freshman; he goes to school, hangs out with friends, and has sex with his father. Ok, maybe not so typical. With the affections (and advances) of everyone from childhood friends to senior classmates, Mira has a wide selection of prospects to choose from; but the only one he really wants is his loving (literally) father Kousuke. So, when Kousuke stays out late and is rumored to be married to his beautiful co worker, what’s a boy to do but cry?
Sayama is a gloomy guy that wears a mask to school every day. What will happen when bad boy Saikawa attempts to rip it off?!
After traveling to Salzburg, Austria to join a strict catholic nunnery, Maria finds that she isn't adjusting to the life of a nun as easily as she'd like. Due to inevitable conflicts with other more stodgy nuns, Maria is soon shipped out to tutor the young daughter of Baron von Trapp – a recent widow with seven children. It is here, amidst the Alps, that Maria will learn a great deal about love, life, and herself.
The story begins with Masaki Michishita, an ordinary prep school student who is rushing to the bathroom in a park one day. Despite his rush, he spots Takakazu Abe, an exceedingly handsome auto mechanic sitting on a bench. The two exchange looks, and after Abe utters "Yaranai ka" (Shall we do it?), the two begin their encounter.
Holding strictly to his family's creed, Kou Ichinomiya has never once, in his life of privilege, owed anything to anyone – that is, until a self-proclaimed Venusian named Nino saves him from drowning in the wake of a dire accident involving Kou's pants. Eternally indebted to the supposed extraterrestrial, Kou moves into her little community under the bridge along the Arakawa river. Ripped from his life of luxury and success, the young Tokyo U graduate now must adjust to his well-appointed hovel, strange new neighbors, and peculiar lover, Nino.
Thanks to the incredible last words of his grandfather, young and adorable Makoto's virginity is the target of every teacher who wants to be principal of his school! Will fleeing to the mountains to recruit his childhood friend Kintaro be the answer to his prayers... and wildest fantasies?
The fifth season of Fudanshi Shoukan: Isekai de Shinjuu ni Hameraremashita Mini Anime.
The fourth season of Fudanshi Shoukan: Isekai de Shinjuu ni Hameraremashita Mini Anime.