Summer Days is an alternate universe prequel to the game School Days, set in the summer holidays just prior to the timeline of School Days. All the original characters are present, except it assumes that they all first meet during the summer holidays as opposed to during the first year of school. Although Kotonoha and Sekai, the heroines of the first game, are both present, the main heroine is Setsuna. [From [url=http://en.wikipedia.org/wiki/Summer_Days]Wikipedia[/url]]

Yuuki first met Kotonoha at the school library in the beginning of second semester, but there was no progress with their relationship. They just frequently came to the school library... One day, he sees Roka at the school library and he meets her again through his older sister, Chie, on the same night. Yuuki gradually falls in love with Roka. Roka is also attracted to Yuuki. Their love, however, doesn't go smoothly... Yuuki hears a rumor that Roka is in love with Makoto. Later he hears that Makoto is close to another girl... Yuuki decides to ask Kotonoha, Makoto's girlfriend, about it to make it clear the fact. From that day, Yuuki's eventful school life starts... [From ErogeShop]

Kei has a difficult past with an abusive father and has problems socializing with people directly, so he chooses chatroom acquaintances over real people. But one day he discovers that his chat partner EVE is his classmate Midori, who has a crush on A,W - his internet alias. He falls in love with Midori but hides his idealized A,W identity from her so she would not be deterred by his real self, tainted by past and present events, and blackmailed into a slave-like relationship with the school's web mistress. [Taken from [url=http://www.animenewsnetwork.com/encyclopedia/anime.php?id=4467]ANN[/url]]

The story follows Makoto Itou who, along with his various female companions, finds himself stranded on a remote island. While awaiting rescue, Makoto and the others must do their best to survive on the island. The game is split into two main parts, story and battle. The story part follows a typical visual novel structure, in which the protagonist, Makoto, interacts with the various female characters and builds relationships with them. The battle part is a tower defense game, in which Makoto and the girls must protect their food supply from wild animals. As characters lose health while participating in battles, players should be careful to manage who accompanies Makoto into battles. As per many visual novels, the plot can take various courses based on the player's actions, such as who Makoto romantically pursues, or potential deaths among the characters. [from [url=https://en.wikipedia.org/wiki/Island_Days]Wikipedia[/url]]