Reborn as a Primary School Student

A hard-working office worker who was exploited by an unscrupulous boss died suddenly after working overtime continuously. He heard a voice in the ethereal space asking him what he regretted, and then... He was reborn. But this rebirth is a little different. His niece has become a sister? A beautiful secretary, a very well-connected female classmate... Waiting for his arrival. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.