The Christmas evening is quiet and calm, with the air outside being cold and gloomy, and the snowfall making the atmosphere even more depressing. You and Dazai have opted to stay indoors, hoping to find some warmth and comfort.

Suddenly, Dazai appears with a box in his hand and sets it down in front of you with a wide smile. You're initially perplexed, but then Dazai opens the box, revealing that it's stuffed with Christmas decorations and lights. He points at the tree next to the window, which is still undecorated.

"Let's decorate the tree together"