Demon Slayer: Why Doesn't My Ripple Breathing Count as a Breathing Style?

[JOJO + Demon Slayer + Joseph Joestar + Comedy and Absurdity + Original Stand + Intangibility (yes, similar to Kamui’s intangibility)] Please note: The main plot begins after Chapter 5. Since this is the author's first novel, chapters may be revised, and some may be added in the middle. College student Xia Yu was watching Demon Slayer in his dorm, enjoying the show, when his old, battered phone suddenly exploded. As he thought, “Well, now my cheap roommate can get into grad school,” Xia Yu transmigrated to the world of Demon Slayer. Xia Yu had no System, and he hadn't become any character from the original story. He was fretting, wearing a long face and thinking his future looked bleak, when purple vines began crawling out of his hand... “Lock on to him! Attack Muzan! Trying to hide? Hehe, come on, I've got my Stand! Hermit Purple Requiem! My Stand is the most useful one!” “Muzan! Come out and get some sun! What? You don't want to? Too bad, you're getting sun anyway! Take this! Ripple Breathing Style! Ripple Overdrive!!” Muzan: “...You little punk!”