The White Queen or The 100 Worlds. 18
Her whole life has changed in a moment when she said 'Yes'
Taking a break from her popular, brilliant, Fullmetal Alchemist; Arakawa-sensei drew up a one-chapter humorous Shounen story about a Frankenstein tournament, for mangazine GX to commerate their 5th year anniversary. (Source: Anime-Source)
Durarara!! 18 Shiryaku
A series of side stories that were bundled with the first press release of all 18 Blu-ray/DVD volumes of the 2nd season of the anime.
18-sai no Kodou
Another tender love story which fails to run smoothly from the master of such works Yukari Kawachi! This is a one volume "novel" type manga. Rui will be a model, and Tougo will be a painter—the two young childhood friends dream about their future. When Rui's father dies when she is 17, she goes to Tokyo, to fulfill her dreams—and meets a handsome make-up artist and...! (Source: Hidoi~! Translators)
18-sai no Himitsu
18-year-old Sako is tired of her loveless high school life. Her only comfort is her teacher whom she frequently visits for love advices. Now that her graduation is coming up, will she be able to seize the love that she has always wanted?
R-18 Love Report!
Riko Mitsumi is sixteen year-old girl who is pretty and a good student. She would be like most girls if she wasn't constantly dreaming about sex and using a pseudonym to write about it. (Source: M-U)
Nanami 18-sai Mama ni Narimashita
Nanami's older sister ran away from a member of a Japanese mafia; therefore, even though Nanami is only a 18-year-old boy, he has to be the mother of the baby and a captive.