Since I played the VN I understand, but I think you should watch the other episodes too, Makina's arc is pretty interesting and I'm also disappionted about Yumiko's arc.
Okay, since the day I started watching anime I heard just one thing.
SCHOOL DAYS SUCKS and stuff like that...so I was afraid of watching.
But today....I just finished watching School Days and DAMN GIVE ME BACK MY 4 HOURS.