Oliver, a 19 year-old student abroad

Hinata Matsuno,got a name as Oliver, an immigrant from a certain island nation, attends a boarding school in a certain state. Due to language barriers and an introverted personality, he is quite isolated in his class and frequently bullied by other students. Out of the thirty-two students in his class, only three are boys, with the other two being locals who rarely interact with him. Naturally, Oliver became the target of the futanaris in his class.

However, Oliver harbors a little secret. The extreme rarity of men in this world has endowed them with talents that futanaris lack—some males even possess two or more talents simultaneously. These talents manifest in various ways, though physical mutations are the most common. Oliver’s talent is arguably unique in the world.

Oliver is the only boy of his family, yet he also has a "sister." Born with two sizable penises, one appears ordinary, reaching a length comparable to an average futanari's when fully erect. The other, however, is his "sister." From its base, it doesn't resemble a typical penis but instead takes the form of a young girl. This penis-girl even appears more robust than Oliver himself, boasting well-defined eight-pack abs and muscular upper limbs. As for her proportionally E-cup breasts, it's anyone's guess whether they contain milk or semen.