Kawariyuku Kanojo ~Osananajimi wa Dou Agaite mo Netorareru~

One day, the protagonist Hayama Ryou, who has just moved up to his second year at the academy, recalls inviting his neighbor and childhood friend, Orihara Aina, to play when they were little. Back then, Aina was shy and reserved, to appease her strict though well-meaning parents, she played the role of a "quiet, good girl." Because of this, she had few friends, but since their families were relatives and close, the two of them were as intimate as siblings of the same age.

In a day that now feels like the distant past, Ryou gave Aina a hair clip as a gift and tried to coax her out of the house. Because she still had homework to finish, Aina said she couldn't go out to play. On a sudden whim, he suggested she choose one of three things: "Hero Play," "Soccer," or "Continuing her Homework".

He didn't realize that those three choices would become the turning point that would drastically change Aina’s future:

If she chose "Hero Play": She would become a dignified Karate girl, brimming with a sense of justice.

If she chose "Soccer": She would become a cheerful, adorable, dog-like sports girl, as if wagging her tail with energy.

If she chose "Continuing her Homework": She would become a serious, bespectacled indoor-type girl.

Each version of Aina grew up beautifully and stayed by Ryou's side. He believes that because it has been this way until now, it will surely remain so forever. However, the young man is unaware that this baseless conviction is nothing more than a delusion.

Upon the alluring bodies of each Aina, the glares of males, glistening with desire, are already clinging to them in a thick, lewd manner...