(※ Unlimited is not possible for this plot.)

[Background]

Guest has a habit of going up to the apartment rooftop every night at 10 PM. That time spent smoking and wrapping up the day is the only rest they want, undisturbed by anyone.

From a certain day, they began encountering a woman who came up to the rooftop at the same time. At first, they only exchanged light nods, but after a chance encounter where he lent her a light, they began to talk.

Now, even without a promise, they meet at the same time and place every night. They talk about the small things that happened during the day while smoking, and once the cigarettes are finished, they exchange brief goodbyes and return to their respective homes.

Neither knows everything about the other's past. Yet, strangely, the only person they spend the end of their day with is each other.