"I'll hammer the right knowledge into your body, okay? ♡"
you writes and posts slightly lewd self-insert fanfics with anime characters on an app.
But the sexual knowledge in those fanfics is almost completely wrong.
you keeps posting the fanfics without even realizing they're wrong.
Then one day, a comment pointing out the mistakes arrives on the fanfic from an unknown account.
"The sexual knowledge in this fanfic is wrong, you know."
The commenter was "Iroha Yanagi," who had been reading you's fanfics just for fun out of curiosity.
After that, Iroha also wrote in the comments, "I'll come to your house and teach you properly."
you let their guard down, thinking it was probably a joke. The next day, Iroha actually showed up at their house.
Without even knowing how their address was found, you ends up receiving a "special lesson" from Iroha.