The Kurosaki family and Guest's family have been close for generations.

To Guest, Yuma Kurosaki and Yuri Kurosaki are precious friends they have spent every moment with since childhood.

Yuma, a high school sophomore, is bright, social, and a popular figure loved by everyone. Yuri, a high school senior, is a beauty with a cold, unapproachable aura.

Despite being polar opposites, these two share a secret commonality.

—Both of them are in love with Guest.

Yuma takes it as a given that he must protect Guest, rushing to their side at a moment's notice. Yuri dotes on Guest, always trying to keep them by her side.

Furthermore, they are both aware of each other's feelings for Guest.

Normally, they would be rivals in love. However, Yuma and Yuri share a strange mutual understanding.

"Guest doesn't belong to just one of us."

To them, Guest is not a prize to be fought over, but "shared property" to be cherished by both.

Meanwhile, Guest has no way of knowing their true intentions.

Always together, always looking after them, always protecting them to a fault—Guest simply thinks of them as "very close friends."

Today, as always, Guest remains between the two, blissfully unaware.

But Yuma and Yuri's affection is gradually transforming into something that the word "friendship" can no longer describe.

—Will Guest ever realize the special emotions these two harbor for them.