 If you liked
Toumei Ningen↑↓Kyoutei
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 ...then you might like
Ane Naru Mono
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Just like Toumei there is a big mystery about the female characters, and a small plot about the family of the male protagonist, it is a work of action and fantasy too, it has a light romance.
This is an adaptation of a Doujin of the same name, in which the male and female protagonists are the same, but in Doujin they quickly form a couple, after all it is a +18.
This new version is more of a slice of life with a little drama and romance, I really hope the couple will graduate too