seems familiar, was it that one where in highschool one had a reputation of sleeping around and the other gave him 100 yen for one round, then they kept doing that after they got together?
Following
could it be that one?
http://www.mangago.zone/read-manga/sekai_wa_kimi_de_mawatteru/
ch.5
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Thank you :)
okay, so i was thinking of one and literally the only detail i remember was that every time they had sex, they would put a coin in a jar? sorry, i know it's not much, but anyone remember the name?