Nanahara Takeshi had reason to suspect that Daiseki Otake had already met her demise; she had been missing for a week, and the four inhabitants of Arosei were living communally. It would be extremely risky to hide a living adult for an extended period. Whatever the four inhabitants of Arosei were aiming for, they were likely to have silenced her.
Arosei glanced down at the ground without denying or defending himself. Nanahara Takeshi had already cracked their method of committing the crime and even guessed where they had buried the body, rendering any excuse meaningless.
He pointed directly at Nanahara Takeshi's feet and said indifferently, "I'm not so bored as to deliberately let you stay in a room with a buried corpse. She's buried right where you're standing."