It's utter and absolute crap, pardon the language. The plot is as follows, some spoilers ahead:
Terumi Minamoto, the main character, is supposed to have a phobia of women due to being mercilessly bullied by girls, who were jealous of how "pretty" he looked, in his life, and yet we barely see anything of that. He also is supposed to get physically sick whenever he drinks milk. Doesn't ever come up again.
He doesn't even look like a girl, or have a pretty face. He just looks like a normal guy from an everyday Manga. This whole plot could have been good, with his Aunt, whom he's forced to live with, teaching him how to not be afraid of women, but NOPE.
She instead decides he needs to have sex with 14 women, one being his cousin whom he thinks of as a SISTER, as part of her "research". Later in the story he practically crosses the line with his cousin, in what could only be described as an "almost rape" scene, and it just gets worse.
They don't pay much attention to his phobia, instead having it be gone in less than a chapter, without you even realizing it, and concentrate on as many sexual scenes as possible, some being between him and his own AUNT.
There's no true character development, and the whole Manga itself isn't worth reading. Stay as far away from this Manga as possible. There are far better Manga to read out there, that are better written.