Based on the erotic game by Astronauts: Sirius.

We live in an age where everyone is streaming. Dangerous video streaming, which is a way to satisfy one's desire for self-expression and approval, has become popular, and there have been a series of scandals across the country. Here at Toogami Academy, students have repeatedly caused scandals with their videos, causing a public uproar, and one teacher is assigned to the school. He is Masayoshi Yamato, an agent known as "firefighter" who specializes in scandals. Under the orders of the chairman of the board, he uses his penis to "educate" the female students who are repeatedly playing around with sex, and calm them down!

(Source: parabook, translated)