When the anime was mentioned as upcoming I went and looked at the manga translated by SnoopyCool and really liked it.
The anime's first ep was pretty good, surprised they snuck actual nipples in there...
I also don't remember Shiori appearing in the manga that soon, but I could be mistaken. She's the little girl with the crush on Seiji who runs up the steps and teases him about becoming his girlfriend.
Then we also see the creepy doll-obsessed guy who was briefly shown in school.
The opening and closing are nice.