Help me pls

It's a yaoi manga and oneshot. It's about a 'happy fluffy mumumu kya omg I'm gonna die by cuteness' type of relationship to the point I shipped those characters so bad. In the end it was revealed that the uke has died by drowing cause he tried to saved kid and jumped from the bridge. It's cute but somehow twisted in the best way it even made my tears fell and I couldn't stop being gloomy for the next days and that time. Sorry for long explanation and my bad eng, but if you do know what the title is pls tell me hehe thank you!