domestic girlfriend is ridiculous but it knows it, and it plays off of that concept quite well. All things considered its written like a soap opera and it follows that logic, but when the characters act irrationally, its because their characters are irrational. Kiss X Sis is one that I haven't seen nor do I intend to
School Days
harem with a sociopath in the center, its great
Bakemonogatari
The actual best one
Le Portrait de Petit Cossette
Shiki
Shiki Specials (episodes 20.5 and 21.5)
Perfect Blue