Responses
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I don't know if this is it, but it has a fireworks from the rooftop scene at least.
http://www.mangago.zone/read-manga/mukidashi_no_koi/
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As does this one (chapters 4-7)
http://www.mangago.zone/read-manga/toriaezu_kiss_shite_kudasai/
(chapter 4 starts here: http://www.mangago.zone/read-manga/toriaezu_kiss_shite_kudasai/mi/c9b5dc9961d822f17a475645395a9bce_chapter-4/ )
I'm searching for a shounen-ai manga i've read a year ago.
The only scene I still remember is that the two boys watched a firework from a rooftop (or something like this) an the eir hands slightly touched. It was a fluffy manga :3
Please help ;-;