 If you liked
Toumei Ningen↑↓Kyoutei
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 ...then you might like
Danshi Koukousei wo Yashinaitai Oneesan no Hanashi
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Slice of Life + Romance + Comedy + Mystery
It is a light romance, which shows the day-to-day life of a couple who begins to live together due to a determined circumstance and over time, a little slowly, the romance between the two goes on sucking, but still there are some mysteries about the female protagonist and the protagonist male is always trying to know more about her and her mysteries