Kamimura Sumiko

Akiyama Youichi adores the cute Nana-chan from afar but he's clueless about girls and terrified of asking her out on a date. He discovers in a very peculiar manner that he has a love rival for Nana-chan's affections in the curvy and sexy shape of Natsuhara Yuri, a classmate and best friend of Nana-chan. The battle for Nana-chan's affections is joined with Youichi trapped in Yuri's body and Yuri using Youichi's body to ask Nana-chan out on a date. May the best, umm, person win!

Yusuke Yamamoto is the son of two gynecologists, but is afraid of women. Then, his father has two women move in with him, in an attempt to cure him of that fear.

Wataru Kamiya is a second-year middle schooler who hates studying. His father was transferred overseas for work and he was left in the care of university student Runa Hazuki, who ended up living with him. Runa is a part-time cram school teacher and Wataru hates going to cram school, so in an effort to change his attitude, she turns to a sex appeal strategy that is sure to grab his attention!(Source: Kodansha)Note: This manga ran in Kodansha's Monthly Shounen Magazine from 1986 to 1988. Because of the sexual content the series was one of the manga placed on "Harmful manga" lists by local and national governmental agencies. The negative publicity resulted in Kodansha discontinuing the series. In 2014, a live-action movie based on the manga was produced. A remake drawn by a different artist with a modernized art style started publishing in 2023.

The legendary manga is reborn with new art! Wataru, a lazy high school student, is visited by the earnest and slightly airheaded teacher, Runa-sensei! So that Wataru can become a respectable adult, she gently starts giving him naughty private lessons!(Source: Comic-Days)Note: This is a remake of the 1986 original "Ikenai! Runa-sensei" manga