Female protagonists from various anime/manga crossovers? They'll all regret it for the rest of

[Crossover anime/manga, Japanese light novels, slow-burn, currently including anime series such as *Saekano: How to Rape My Girlfriend*, *A Silent Voice*, and *Rascal Does Not Dream of Bunny Girl Senpai*]
He is the childhood friend of Nishimiya Shoko, a hearing-impaired girl, and he directly and forcefully confronts the bullying Shoko suffers at school.
He is a loyal fan of the bestselling light novel author Shizuko Kasumi, and the sales of "Love Metronome" skyrocketed because of him;
He is the childhood friend of the famous illustrator Eri Kashiwagi, and they made a promise that he would make her his exclusive illustrator.
……
Yuto Itsuka is transported to a crossover anime world and obtains a system that calls itself a "love simulator".
He thought it was just a simple word game, but the system threw him directly into a simulated world!
"Wait, why do I always die after the simulation ends?"
"System, didn't you say that the simulated world doesn't affect reality? Then what's going on with these people?!"