 If you liked
Nicola no Oyururi Makai Kikou
|
 ...then you might like
Shadows House
|
These two features a young girl who is trapped and decide to venture in a fantasy fairy tale society with strange and mysterious worldbuilding.
The main protag is both have their childish aspects of them exaggerated followed by tragic backstories for both of them
these two are also serinen but features no gore and only mildly frightening scenes and probably should not have been