Actually, the title still has possibility of natural internal conflict among themselves, added with non-human external factors (predators, food, competition). Hoped for this version.
Although having them living in cardboard house instead of tree root house seems to warran a human involvement.
Be born easy!She looks like Reimu... charming the world with her beauty!Little ones are being so easy!Yuyyuun!
Easy!Reimu's glittering stardust angels!Collapse of the Happy FamilyShe looks like Marisa, little one who's brave and cool