My older cousin Yuko, who’s also my childhood friend, is beautiful and has a great figure, but she’s been single her entire life and loves dating sims focused on charming handsome male characters – making her a bit of a peculiar individual.

During the summer vacation of my first year of high school, I was receiving tutoring from her, as she had already secured her university recommendation, when she told me about a certain otome game.

But I, who preferred an RPG rumored to be a "crap game," just brushed her off without much interest.

And the next day, when I woke up, I had become a child in a Western-style fantasy world.

What's more, my name was Arnold.

“Isn’t he one of those affection-based characters from Yuko-neechan’s favorite game?”

But there was more…

“Levels? Stats? Skills? Is this…?”

For some reason, it seemed the world of "Shadow Quest," the RPG I loved so dearly, was also mixed in. Several years after I began living in this second world, making use of that knowledge...

“Hiroki, I’ve become Rosa, the villainess… my life might be over… Wait! This is no joke! You have to prevent my downfall! Hiroki, you must cooperate!”

“…”

Unable to abandon my exasperating but inseparable cousin, I resolved to struggle for a brighter future in this bewildering world where the settings of these two games were mixed.

As for what will happen in the end… even I don’t know!