Main guy is in soccer club and listens to senpai's girlfriend talk about a cursed app that lets you control the person you love.
A girl that's just how he likes them transfers to his school, she plays soccer, and, as there's no girls soccer club, she plays in the boys club.
Because of that the teacher seats her next to him and asks him to take care of her. He gets nervous because of her looks and spanks him for him to man up, the girl has a kansai-ben-ish accent.
After a month of practicing the girl shows how good she is and she's actually better than our main guy.
The guy fells for her but doesn't want to accept it and in his frustration from always losing to her he ends up getting the cursed app in his phone.
The app has the girl on screen and whatever he does to her on screen will happen to the real her.
After testing the app (in a somewhat perverted way) he notices it actually works.
After that, he takes a bug from the girl's chest and saves her from falling some stairs (well, he just made her fall in some bushes instead of the ground) using the app.
Because of those events, the girl starts believing that it's not a cursed app but an app of "love" and starts falling for the user that she doesn't even know if he actually exists.
Both are chosen for a practice match, the girl is a starter, the guy is benched. He kinda resents her for this.
On the day of the practice match, the girl is really nervous and is pretty much useless during the first half of the game, after that he goes to her and tells her "You're way better than this!", she confesses that she has a big stage fright and that she'd like the guy with the app to move her like if it were a videogame.
The guy thinks a bit, notices he loves her during that, and decides to spank her using the app to "wake her up", after that she becomes the star of the day.
They go back home together and she starts talking about how she'd like to thank the app's user and so on, to which he only says "that guy must be satisfied just knowing he could help" and things like that, she then takes his hand and thanks him directly.
And after that there's some more bits of tolove-ru (first series)-like fanservice comedy to end it.