Dousei Recipe is done by the same mangaka as Mel Kano. It tells the story of a couple, both very innocent and in love with each other, who are now living together! Takeshi is a pure-hearted college student who is enticed by his girlfriend that has run away to live with him. Temptations ensue. (Source: SCX-Scans)
First volume contains 2 prelude chapters.

Shinjou Shouryuu is a healthy 17 year old high school boy. Many of his kouhai wonder why such a great guy doesn't have a girlfriend. Ask him and he'll tell you that between school, work, and saving his kouhais from bullies doesn't leave him much time to go on dates. So he instead goes online to "F.I.L. GATES". There in the chat room his alter-ego, Kakeru, is infatuated with the girl called Hal. Hal sends a message reminding him that Sunday will be the 6 month anniversary of when they first met (online) and that she wants to meet him in person! And let's just say it's not your typical first date.
(Source: MU)

High School Girls chronicles the raunchy high school lives of main character Eriko Takahashi and friends Yuma Suzuki, Ayano Sato, Akari Kouda, Kyoko Himeji, and Ikue Ogawa ("The Moron's Group") as they attend all girls "mediocre princess school", Yamasaki Girls Academy Fuji High School (referred to as "Saki Girls" for short). The manga emphasizes that for the most part the stories come from Oshima's own real life experiences.