Story: Childhood friendship turns into romance, but the relationship gets thrown into chaos when they start thinking about sex, just as romantic rivals appear on the scene. The story plays out twice: the virginal high school version, and the sex-fueled college version. It's a less-well-done version of Hajimete Datteba, but a whole lot ecchier.
Art: Quite good throughout. Especially the sex scenes, if you're into that kind of thing. And if you're not into that kind of thing, probably best to avoid this manga.
Character: The mains are quite likable, if pretty dense. The romantic rivals are awful, and add nothing. The friend characters are underdeveloped. Honestly, the best character is probably the main boy's sister, who could use a manga of her own.
Enjoyment: I liked it, probably more than it deserved. It's a very fast read.
Overall: 7/10 is probably generous, but I did sort of like it despite its flaws, and the artwork and main characters are good enough. If you want plot, or are looking for something reasonably thought-provoking, go elsewhere.
