He was so ashamed of his failure that he wished he could crawl into a hole.

He inserted his finger into the anus.

The Oniwaban was in charge of information gathering and security during the Edo period.

They appear to be antagonistic on the surface, but in reality, they are seemingly not part of the same group.

He started studying the day before the exam, which was exactly a case of failing to make a timed preparation.

When he had a problem due to his own actions, he remembered the phrase 'chickens come home to roost'.