Mother (2010)

Both star Ashida Mana. About the lives of children from abusive/unstable homes

Both have ....

-same writer
-Kurashina Kana <3
-some suspense plots
-(very) depressing tone in the start of series, but gradually become more hopeful
-somewhat unique and beautiful ending

Both are about a little girl being abused by her mom and step-dad until someone steps in and takes her away in order to save her.

This is an adaptation of other one.