If you hadn't figured it out already, School Days is a romance drama about a guy who cheats. Because it's a story about cheating, it's very sexual and very ecchi. But even if you're not into the fan service, School Days makes you truly empathize with the girl(s) who are affected by our main character's dishonorable sexual exploits. You will also witness the results of being with a guy who cheats on his girlfriend with you.
The story is quite good and the characters are quite serious and somewhat developed considering the short length. Each character is quite changed by the end. Furthermore, the only overly loud comedic relief character (an archetype which severely irritates me personally) is a guy friend of the main character who does not often make extended appearances. The main mains include the perverted, cheating guy, his shy and timid girlfriend, and his spunky, outgoing "friend," and a few other less important girls to make up the harem.
Without spoiling, the ending is hardcore. Many people will not like it because they are sissies who are such fanboys and fangirls that they can't recognize what makes for a dramatic story; however, those among us that are as hardcore as the ending of this show will be impressed.
Don't pass this off as a generic school life anime. It is epic.
