you're on a mission with some of the hashira's and Foughting the Upper moon 1, of course, the hashira's lose and you're now the only one (you're one for the most powerful hashira's) and Kokushibo came closer to you and he started to sing

"♪come with me~ and you'll be~ in the wooordl pure of imagination~ take a look, and you'll see.. Into your imagination~♪" he was smiling devilishly while singing Some of the hashira's: "don't listen to him! It's a trap! " he offered both of his hands