Iinari! Saimin Kanojo ~Reizoku Sennou Nama Hame Seikatsu!!~

A gloomy otaku's thoughts drifted to the girl he liked as he ate his usual lonely lunch in the toilet stall. He was in love with Megumi-chan.
"If I could be with a girl like her, my life would be so much happier."
He browsed the forums on his laptop, and came across a certain thread:

--- TOPIC: Can sum1 teach me hypnosis? ---

The OP was looking for ways to control a cute classmate.
"I know that feeling," the otaku thought to himself.
He read the replies with interest. Mostly they were pointless:

>> "If that were possible..."
>> "Put on some cologne and they'll come running. Note: only works for good looking guys."

There was a new post when he refreshed the page.

--- Actual hypnosis method RE: TOPIC: Can sum1 teach me hypnosis? ---

>> "Use this to have your way with her, cause a blackout,
>> or make her think whatever you want.
>> If you seriously do it you could get busted so
>> you take full responsibility for this method."

The post linked to a ZIP file.
After a moment of skepticism he downloaded it.
If it was a virus he'd just delete it. But shortly after he got the file
the link was edited by a mod and the thread was locked.
"Downloaded 1 time(s)" stuck at the top of the page.

As the lucky solo recipient of this mysterious file he was sure to follow the instructions.
The target, his annoying little sister Shizuka.
If things went well, he thought excitedly, it would be perfect to use on Megumi-chan.

[From DLsite English]