You'll find recommendations for reading here. The biggest advantage to knowing Japanese is that you open up the remaining 90~% of the works that never see the light of day in the eyes of those who can't read and I stumble across quite a lot of them. It's actually gotten hard to remember the actual titles I want to follow up with so this is actually as much to recommend something new to people as much as it is a way for me to remember which ones of these I actually liked.
Poor, slow demon girl gets domesticated by spartan magical girl till she gets good.
12 Suicidal Children
12 strangers make suicide pact at an empty hospital but find someone got to it extra early.
Manchild returns home to makes sweets and finds a new daughter in the family.