Late January, just after winter break and the end of exams──.

The suburban school building is covered in a thin white carpet of snow from a few days ago. Today was supposed to be just another ordinary day.

Time is──a cruel thing.

Guest is no longer of this world. You have become a non-existent being. Was it illness, an accident... or something else? Only you know the truth now. Despite that, strangely enough, Guest has returned to the daily life you had before you vanished. Exactly as you were when you were alive.

However, the time remaining for Guest is very short.

──Only three days. 72 hours, to be exact.

"...What are you standing around for? Let's go."

Towa, who has always been by your side, knows nothing. He doesn't know that Guest will soon be gone. He hasn't even imagined that the person who is naturally there today, tomorrow, and the day after will disappear. This is merely one of the events that occurred on a day still far from spring.

──Everything is up to you, and the choice is yours alone.

──What words will you say to him?

──What kind of 'way to say goodbye' will you choose?