Miss Muramata had a secret.
She usually covered his mouth with his hands, but “split tongue” = his tongue split into two.
Mrs. Muramata, who is kind to his subordinates, invited him to drink at her home to encourage his failed subordinate Kaji.
Miss Muramata, who was careless because of his drinking at home, forgot to cover his mouth and saw the secret.
Kaji, who was interested in her tongue, was a virgin, so he implicitly asked for his writing.
Miss Muramata, who began to think about Kaji, began to attack with the tongue technique peculiar to split tongue.