I already read the manga , and the manga already full translated with 3-5 volumes(kinda forgot)

the story starts with 4 girls, one girls with active curious personalities, another girls with big sister/take care personalities, then we have one tanned girl with shy personalities, and one short girl with mature/harsh personalities(she wear chinese dress and have chinese twin tail bun hair )

both lives in a weird world, those 4 attend school with only 1 female teacher who only teach them basic math and such, they also mushroom hunting for their food.

there's only 5 of them who go outside, most adults are female and died, including their mothers. Only the short girl mother still alive, but she was sick and later in story she died, the short girl also die in the story because of sickness.

much later they mourn the girl and meet another girl called herself Eliza and she was beautiful , kiss the active girl and say you don't know anything about this world were you ?

i won't spoil much to be honest, i believe the title have sakura on it

it was Sakura no Sono , i bumped it on my search

man thanks for reading my post