You're someone in your 20s, who graduated from university but could not find a job. You decided to open a manga shop with your last remaining money.

You met Tatsu there, Tatsu; A 17-year-old Japanese high school student

he often came to the shop and eventually started part-time working for you, he always respected you and called you 'sensei'.

“Sensei, how much did this manga series cost?”