Yuiga is the main protagonist of the We Never Learn series. He was appointed as a tutor for Fumino Furuhashi, Rizu Ogata and Uruka Takemoto as a condition to get the VIP nomination for getting into a college.

Nariyuki is shown to be a hardworking student that even though he was not good at studying in the past; following his father's encouragement to become someone who can do everything. It was through hard work and diligence, he was able to achieve a steady grade of 80% on all subjects.