If you're looking for manga similar to Senpai niwa Atama ga Agaranai!, you might like these titles.
The king was about to be assassinated by an assassin, whilst the guards rushed in to rescue.
Nakamura Kouta is a freshman in high school who dislikes girls. One day he is visited by his childhood friend Karen, with whom he lost contact over time. Karen is a tomboyish girl, who refers to herself as "Boku" (a first person pronoun usually used by males). She asks him to help her become more feminine to win the affection of Itsuki-san, a colleague at her part time job. Even though he is reluctant at first, he more or less voluntarily agrees to help her out in the end. But making a lady out of the clumsy Karen with nothing but his extensive galge experience as reference proves more difficult than he could imagine.
Jigokumeguri Haru is rich, famous, and friendless. Thanks to her cold, stuck-up personality, she goes from school to school, looking for a place to fit in–but with no luck. When she crosses paths with Kawayanagi Tsurezure, she discovers that he gives her antisocial tendencies a run for their money. Has she finally found a kindred spirit?