 If you liked
Koisuru Boukun
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 ...then you might like
Sekaiichi Hatsukoi: Yokozawa Takafumi no Baai
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They don't have the same story and one is a manga and the other a light novel but I'll tell you their similar aspects:
* Tsunderes uke (Yokozawa and Souichi) at the first sight you think they are seme because their rude personalities and aspects, but they are just tsundere characters.
* The semes in both (Kirishima and Morinaga) at the first sight you think they are uke because their soft and pacific personalities, so they are wanko semes.
* There are blackmails from the "innocent" seme to get the uke attention in both and with that fact they get closer in their relationships. As I
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