Part 227: (Hint 19)

"To start, one of the adult culprits carried out the first twilight, then played dead."
"Since we know that all of the servants with master keys were innocent, there was no way for the culprit to lock the door to the dining hall from the outside. So, we know the one who locked it did so from inside the room."
"And, in order for them to play dead, they needed another culprit to lie when examining their death."
"Since Genji-san is innocent, the examinations of all five suspicious victims were performed by their own children. So, the child of the first culprit is the second culprit."
"And, the child culprit couldn't carry out the crimes once they start occurring in the guesthouse. However, the adult culprit was sealed up in Natsuhi's room. So, a second adult culprit was needed."
"Two adults, one kid. That's what our culprit group looks like."