I mean that it started like rlly bad, like cliche/bad storyline then it started getting better.
Not really bad but i used to occasionally read this manga named 19 Days because the couple was cliche but also funny and made me suffer from second-hand emmberssment. Later the second couple got intruduced and i was immediatly hooked.
Uhm maybe these?
http://www.mangago.zone/read-manga/a_shoulder_to_cry_on/?ve7D
http://www.mangago.zone/read-manga/shounen_no_kyoukai/
http://www.mangago.zone/read-manga/good_day_to_go_crazy/ not sure if this starts bad but it was good imo
i dropped "my starry sky" when it was just starting. i came back when it was already completed and skipped to chapter 10. best decision. it made me an emoional mess and its definitely one of my fave and unforgettable reads.
stories that started shitty but ended up being a masterpiece/amazing at the end. BL and completed please.