Kimi to Tsuzuru Utakata - Vol. 1 Ch. 3.5

[MangaDex]

 

[jomamaphat]

Oh damn, the feels

 

[IbnAurum]

Poor lil sis, she wants to hangout too 😢

 

[Carn109]

Spend some more time

 

[Noteveryonewd]

Idk if we can say it's a spoiler or not, but her death is canon now. It's so likely that she had some kind of diseases or whatever thing that will guaranteed her death after the summer lol.