Minamoto-kun Monogatari

is a Japanese "seinen" manga series written and illustrated by Minori Inaba. It was published by Shueisha, with serialization in "Weekly Young Jump" magazine from September 15, 2011, until its conclusion on September 5, 2019. It is compiled into a total of sixteen volumes.
It is published in French by Soleil and in German by Panini Comics.
Plot.
Terumi Minamoto is a young man born with a feminine face and is considered pretty enough to make people think he's a girl. Because of this, Terumi's middle school years were beset by bullying, spearheaded by the most popular and beautiful girl at the time, Chuujou Tsukasa, as an act of jealousy. Due to multiple acts of forcing Terumi to cross dress, as well as bathing him in sour milk, Terumi developed a fear of women and a hatred of milk due to the trauma. The long term consequence of this also resulted in Terumi never getting intimate with women during his high school years, finding even the act of talking with a woman awkward and painful. Just as he enters Shiun University and makes a promise to himself to overcome the trauma of his past, his father remarries and asks him to move out of the house. Terumi is arranged to live with his aunt, Kaoruko Fujiwara, for the time being. She is an extremely beautiful and talented young woman, who is also a non-tenured professor at his college. When he arrives at her apartment, she drags him into a special project in which he must seduce fourteen different women in the same fashion of the protagonist of "The Tale of Genji".
As the story progresses over the span of two years in-universe, Kaoruko introduces Terumi to women who share their namesake with characters from "The Tale of Genji", including his cousin (who happens to be the first); Terumi slowly but surely starts to drop his awkwardness and fear towards the opposite sex. With each woman that he meets, Terumi learns to identify the target's quirks/problems, get them to open up to him and ultimately end up having intercourse with the woman in question. Increasing Terumi's prowess in sex is Kaoruko herself, who is willing to use her body and knowledge of a woman's mind to make Terumi more privy to sexual acts, though she and Terumi never commit incestuous intercourse and stop before it goes too far. Kaoruko also notes that due to Terumi losing his biological mother at such a young age, he has developed a Oedipus complex, explaining why Terumi is drawn to older women and why he enjoys engaging in sexual acts with his aunt. Due to the experiment, however, Terumi is able to speak and sleep with woman closer to his own age. While there have been times during the experiment that Terumi had desired to stop in order to pursue a more serious relationship with the woman in question, circumstances pop up where the relationship comes to an end, forcing Terumi to continue, though at least maintaining a cordial friendship with the targets.
Terumi also meets up with his nemesis, Tsukasa, at the same university. Thanks to Kaoruko, Terumi discovers that Tsukasa is engaged in a loveless affair with the University's most popular and influential professor, Konoe. Desiring revenge against her, Terumi orchestrates events that breaks Tsukasa and Konoe up, with Terumi discovering that the object of his torment is not nearly as terrifying as he made her out to be, allowing him to take the first steps in overcoming his trauma. Terumi's actions in standing up for himself also results in Tsukasa developing feelings of affection for her former victim. Subsequent events, such as competing in a beauty pageant against one another, only increases these feelings, with Tsukasa eventually admitting to herself that Terumi has grown strong since their middle school days.
After sleeping and/or meeting with 13 targets of the experiment, Kaoruko reveals to Terumi that she is the final 14th target and conducted the experiment not only to further her own research but primarily to enrich Terumi's life experiences as a tribute to Terumi's mother, Kirino, who Kaoruko was close to. Desiring to increase her status and reputation away from Konoe's influence, Kaoruko tells Terumi that she will be moving away to another university but will gift her apartment to her nephew, encouraging him to grow and develop without her influence. As a final erotic experience, Kaoruko and Terumi cross the line with each other and commit incestuous sexual intercourse with one another. One year later, Terumi and the targets have moved on with their lives, all better people for it, with Terumi desiring to become a researcher of Genji's Works upon graduating, following in his aunt's footsteps. The final scene of the story showcases Terumi drinking milk without any problems, signifying that he has overcome his trauma and fear towards milk, women and Tsukasa at long last.
Characters.
Targets.
Labeled as "Targets" by Kaoruko, each one of them share some similarities with one of the women seduced by Hikaru Genji, and she instructs Terumi to get into relationships with them, for the sake of her research.
She's based on Utsusemi from the Tale of Genji.
Reception.
Volume 3 reached the 48th place on the weekly Oricon manga charts and, as of April 20, 2013, had sold 24,973 copies; volume 4 reached the 27th place and, as of October 27, 2013, had sold 53,436 copies; volume 5 reached the 24th place and, as of April 27, 2014, had sold 61,646 copies; volume 6 reached the 34th place and, as of October 19, 2014, had sold 35,693 copies; volume 7 reached the 25th place and, as of April 26, 2015, had sold 65,645 copies.
On manga-news.com, the series has a staff rating of 15 out of 20. On Manga Sanctuary, it has a staff rating from one staff member of 6 out of 10.