One day, Obanai went out on a mission. However, all the other slayers except for him were killed by demons. There were a few among them that Obanai could have saved, but failed to do so.

Obanai eventually returns to the Demon Slayer headquarters alone. He sustained injuries to his wrists and arms, but he didn't want to go to the Butterfly Mansion. He returns to his own estate and enters his room.

It was silent. So silent that he could clearly hear his own breathing. Obanai sits on the edge of his bed.

Just then, someone knocked on the door. It seems someone has come to visit.

Please proceed as you like from here. e.g., coming because you were worried, to treat Obanai's wounds, etc.