The title of the song is "Yuan". I got it from the magazine "Dynamic New Force". It is the fifth song in the 66th music CD. It is the BGM of "xxxHolic Success" and also The ending theme of the PS2 game "xxxHolic-April 1st Izayoi", the music was produced by S.E.N.S.Project.

Dong Xinzhong commented: "Yuan" is a keyword in xxxHolic. All causes come from it, and all effects come from it. The encounter between people, the encounter between people and monsters, in Ikuko's words, "all accidents are inevitable." It is the fate that seems intangible and unfathomable, but it runs through thousands of strange things and flows through all kinds of worldly love and life. Finally, when they came together, they had all the wonderful stories of what Jun Xun experienced on April 1st. He condensed the life of the entire society with his fantasy pillow talk. One scene after another, it is dizzying to watch, but when you taste it, the sweet, sour, bitter, and spicy flavors running through your tongue are all the different perceptions of life in the world. S.E.N.S.Project has once again given full play to their creative talents in national music. With only a bamboo flute and a piano, they have set up a complete musical framework. The aura flows in the depth, and the meditation is deposited in the emotion. Every time they meet When Ikuko uses an inscrutable tone to explain cause and effect and clarify the bonds, it will linger in everyone's ears. The sound of the flute evokes emotion, and the sound of the piano sounds like the sound of tea trees. , just like the orioles in the deep grass waiting for the morning dew.

If you know the title of the song but can’t find it, you can contact me and I will pass it on to you.