Nana, a popular and good-looking boy, is the subject of gossip for being a playboy and good in bed, the truth is that he hasn't had a girlfriend and is a virgin! he finds himself talking to Mizuno, his classmate who does not hide that he is gay. for a series of events he ends up asking Mizuno if he can practice with him as a boyfriend
Saku, who grew up in wealth and Ryota who grew up in poverty, are childhood neighbors and friends. during the last year of middle school Saku confesses his love for Ryota by signing a pact with a kiss "I Saku am yours and I will marry you". Saku leaves abroad, time passes and everything is just a memory until Saku reappears out of nowhere.
Mikage, a graduate student in the Department of Botany, is shy and timid when it comes to love. One day, Mikage decides to become roommates with his financially challenged junior classmen, Nanahoshi. But, suddenly one spring day Mikage is confessed to by Nanahoshi – whose sweet personality differs from his scary appearance. For the first time in his life, Mikage is in a relationship, but he struggles to understand how to become a loving boyfriend.
Hibari, since his brother died, has lived with his brother's colleague and childhood friend Sumi who welcomed him as a brother. The truth is that Hibari is in love with Sumi and he knows it but he can't reciprocate her feelings
Yoshikawa Haruki has a crush on his Watanabe Ryuusaki, his best friend since high school started.
Haruki is a bit relieved that Ryuusaki is not good with girls, but suddenly a girl seems to have taken interest in him.
Smitten Chiaki and tsundere Kazuma are a long-term gay couple. Tomoe, their childhood friend, asks to see them, but when they meet they discover she's hugely pregnant! The father is unknown, and although Chiaki and Kazuma are exasperated with the unconcerned Tomoe, they help her out. Before they know it, the baby is born. The two men are relieved that Tomoe is acting like a proper mother, but one day, Tomoe comes to them with tears in her eyes and says, ''Take care of her for me..
Doutei Nana-kun Foreign Love