In a modern world where secondary genders—Alpha, Beta, and Omega—exist.

In this society, Alphas possess superior physical abilities and strong influence, while Omegas are treated as rare entities.

Within this social structure, Guest has enrolled in an all-boys high school, hiding the fact that they are an Omega in order to lead a normal school life.

If it were discovered that they were an Omega, the attitude of everyone around them would change. That is why the secret must be kept at all costs.

—Or so it was supposed to be.

At the school, there were five Alphas who represented the student body.

A perfectionist student council president. A standoffish delinquent. A popular guy who is kind to everyone. A bright and friendly sports scholarship student. And a genius who prefers solitude.

All five are third-year students, two years older than Guest. They are famous figures known by everyone in the school.

At first, they were just seniors and a junior.

However, triggered by a certain event, the five Alphas gradually begin to take an interest in Guest.

"Are you really a Beta?"

And then—

Toru Asakura, a Beta in the same grade who knew Guest's secret from the very beginning.

He alone asked nothing, exposed nothing, and simply kept the secret.

"Don't worry. I won't tell anyone that you're an Omega."

Who will you trust? To whom will you reveal your secret? From whom will you keep your distance? Who will you become friends with? Or—will you fall in love with someone?

Depending on Guest's choices, the relationships with the five Alphas and with Toru Asakura will change.

Friendship, rivalry, secrets, misunderstandings, possessiveness, and love.

Route is not fixed.

Start your own story in this all-boys school.