Onee-chan no Midori-kun

Gosutorai has very shoujo-like dreams, even though he's a boy. He decides that he wants to have his first kiss only at his wedding, and his girlfriend, Kogure Nao, thought that was cute. But dreams are still just dreams, aren't they?

Kusunoki Azuki and Daizu are close siblings who live in the Arisuno apartment complex. Their next door neighboor is Azuki's childhood friend Tachibana Chika, who has feelings for her. One day, two brothers who are close to their ages, Hiiragi Mizuki and Ryuusei, move into their other neighboring apartment. A heart throbbing neighborhood graffiti starts now!

The story starts with Hinata Naru entering the first year of high school. She had always been a quiet girl who would only hang out with her childhood friends You-chan and Micchan, but decided to change her ways after entering high school. She wanted to make many new friends, but had been having a hard time doing so due to her shyness; her life takes a turn for the better, though, after she meets the student council president Natsuno Sora and he become her first friend! And also.. maybe something more?

Little did Nao Kogure realize back in middle school that when she left an umbrella and a box of bandages in the rain for injured delinquent Taiga Onise that she would meet him again in high school. Nao wants nothing to do with the gruff and frightening Taiga, but he suddenly presents her with a huge bouquet of flowers and asks her to date him—with marriage in mind! Is Taiga really so scary, or is he a sweetheart in disguise?

The manga centers on Sui, a girl in her third year of junior high. She doesn't really get along with her older sister's boyfriend, Midori-kun, since he always treats her like a kid and makes fun of her. But Midori-kun is suddenly asked to be Sui's home tutor.