Shinji Ogishima has been a dispatch substitute at the school for three months.
He's already developed an ulcer working under headmistress Sumika Amamiya.

Sumika is the chairman's granddaughter and the president's daughter. She has the
personality of a spoiled girl who grew up in an entitled, selfish childhood bubble of power.

He's suffered from her aggressive style, unable to respond.
The stress builds up, and he turns to his old hobby of aromatherapy,
something he's developed as a skill for some time.

One day Shinji reaches his breaking point.
Sumika insults his aromatherapy hobby.
In his heart, he makes a vow.

He will concoct the perfect punishment using the scent she insulted...

[from DLsite English]