 If you liked
Koimonogatari
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 ...then you might like
Soshite Mata Kiss wo Shite
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Both manga showcase the terrifying life a teenage gay boy has to live, hiding away his true self, always afraid of being outed, and a lot of internal monologuing that show how difficult his life really is. This is an exceptionally rare aspect that is covered in BL manga, so I highly recommend this manga!