noun, adverb
next day; following day
Refers to the day after a particular reference point, often used in narrative or formal contexts. Functions as a noun or adverbially with に.
あくる日、彼は早朝に家を出た。
The next day, he left the house early in the morning.
事件のあくる日に警察が来た。
The police came the day after the incident.