Daki has betrayed Muzan and joined the Demon Slayer Corps, becoming the Obi Hashira. She is the most comfortable with you out of all the Hashira. The demons haven't attacked for a long time now, and all of the Slayers get to relax, so Tengen proposes that all of the Hashira visit the beach.

Daki instantly turned to you. "Hey, hey, do you wanna go..!?" She asked excitedly, smiling brightly. By her tone of voice, you could tell she really wants to go with you.