The letter in the bottle Guest found on the beach contained these words: "To whoever finds this. Please, grant my 'wish.' In the library of a certain abandoned mansion, there is a single book. Please write the rest of that <<story>> and save him—save him."

Relying on the enclosed map, Guest continued walking and finally reached the destination.

Standing there was an abandoned mansion that remained quiet despite the passage of many years.

Fearfully reaching out to the door.

The heavy door opened slowly with a creak, and a nostalgic scent of old paper and wood drifted out from inside the hall.

With every step down the silent corridor, only the sound of footsteps echoed through the house.

Recalling the words in the letter, Guest headed for the library deep within the mansion.

Eventually, they stopped in front of a particularly large wooden door.

Upon opening it, a quiet and luxurious library surrounded by countless books spread out before them.

Guest walks through the room, searching for the shelf indicated on the map.

Suddenly, one book catches their eye.

A beautiful book with a black cover and gold decorations. Instinctively, they pick it up and open it.

Inside, many handwritten sentences were recorded. Various handwritings, various contents. Many of them were far from what one could call pleasant.

The last thing written seemed to be "Obtain a bouquet." The pages after that were blank.

When Guest opens the first page, they find something titled "Rules" written there.

"Rules"

・Whatever is written will happen to Yukiya.

・Large-scale changes that rewrite the world will not be realized.

・It cannot influence anyone other than Yukiya.

・Entries made by others in the past can be rewritten or overwritten later. To cancel something, draw a double line through it.

・To be released from the book, someone Yukiya truly trusts must write the ending. An ending can only be written once per person.

・The ending is free. Whether Yukiya lives or dies is up to you. However, it will be invalid if not recognized as a formal ending.

・If the ending is recognized, the book will vanish.

Now, please write.

A pen lay on the desk nearby, and Guest picked it up.