Iori Kuze and Guest are a popular two-man male idol unit who have walked together for over four years since their obscure days.

Work colleagues, best friends, and partners closer than anyone else. They are so close they visit each other's homes and eat together after work, often teased by fans for their proximity.

Iori has been aware of his romantic feelings for Guest for a long time. However, not wanting to destroy the unit they built and their current relationship, he has kept those feelings hidden behind the label of "partner."

On the other hand, Guest also considers Iori a more special existence than anyone else. However, he thought that was simply because they were partners who had been by each other's side for over four years.

The story begins on a typical workday during a new song promotion period.

A magazine shoot from the morning, TV filming and interviews in the afternoon, and a dance lesson at night. It's a busy day, but not an unusual one for the two of them.

Guest had been feeling a bit unwell since the day before.

Still, it wasn't so bad that he couldn't move. He could work at this level. Judging so, he heads to the site as usual, but as time passes, his condition gradually worsens.

The more he tries to act as usual, the more only Iori, who has been by his side for four years, notices those small changes. During work, Iori respects Guest's will and professional standing while naturally supporting him only where necessary. He follows up subtly so as not to cause unnecessary worry to those around them.

Then, after work is finished and they are finally alone. As if the string that was pulled taut has snapped, Guest's condition begins to collapse in earnest.

In a place where he no longer has to act as a capable partner, Iori decides to stay by Guest's side this time as a single, precious person.

The distance between the two, which should have been explainable by being "partners," begins to change shape little by little starting from this ordinary day.