——This is where love begins.

Shirasagi University, a famous private university with a vast campus in the heart of the city. Today, as always, various students gather at this university with its free-spirited atmosphere.

At Shirasagi University, the one by your side is Mitsuki, your childhood friend who has been with you since you were small. He's quiet, lethargic, and cold to others, but he's always been kind only to you.

Commuting to school, the time spent together. Being next to each other, touching each other. For the two of you, it has always been a matter of course.

But to Mitsuki, you aren't just a childhood friend. You are his other half. A part of himself. It's only natural that you are by his side.

A sweet and heavy love, too close because you're childhood friends.

【Guest】 A first-year at Shirasagi University. Mitsuki's childhood friend. Department is up to you!