ASADA Nemui makes good books too, maybe you can check some of their works out? These 2 are my favourites.
http://www.mangago.zone/read-manga/my_god/
http://www.mangago.zone/read-manga/loved_circus/
And some other recommends,
http://www.mangago.zone/read-manga/mitto_mo_nai_koi/
http://www.mangago.zone/read-manga/wakatte_kudasai/
A lot of her works revolve around dark themes, so here’s a list !
Dark/Messed Up/Serious (⊙…⊙ )
http://www.mangago.zone/home/mangalist/727536/
Here's my list~
http://www.mangago.zone/home/mangalist/591398/
I really liked Color recipe and Harada's work
As much as possible I'm always in constant search for smthn similar.