Clearly not the authors best work. The stories were really weak. It was a weak attempt to pair up the characters, not very convincing. I can't really get a feeling of love from reading this. I wasn't really interested.
The first story was pretty good. At first I didn't like the characters but they get better by the end. I thought Isoyama was just an annoying kid, but he didn't give up after being rejected and I started to him, he turned out to be pretty cute after all. Shiratsuka comes off as cold, but turns out that he's really caring and gentle, and at the end he reaally spilled his guts(figuratively), so they do love each other after all and they become a lovey dovey couple(the best part).
The second story. Momo was supposedly in love with Isoyama, but it isn't really shown, he doesn't seem sad about it at all in my eyes. So he sees another guy and can't stop thinking about him. They have sex and Momo confesses when he sees Kuwana with another guy, happy end.
Story three, Momo moves out of Yone's room to be with Kuwana. Yone gets a new roommate, Kei, who Yone ran away from three years ago because of his possessiveness. Kei has sex with Yone's girlfriend and they break up and she attacks Kei. Yone and Kei get back together because they still love each other.
The extra is about Momo and Kuwana. They are roommates now and they are happy. Not very special even though the extra is supposed to be the best part.
I didn't find any of these stories very convincing. I can't tell how they all fell in love. It could have been alot better. It could use more comedy or more emotion, something. This was just bland. I usually like inter-connected stories where the characters show up again, this was just played badly, there really is no point.