It is an arrangement of the guitar instrument ONE OK ROCK "NAIHISHINSYO [内秘心書] ".
Sound source only.
Please see here ↓ for the performance video.
   • 内秘心書をギターインストアレンジして弾いてみた  

I made it with the goal of adding the original while keeping the original song.
In the future, I plan to post more such arranged songs.