(Crossover) Sawada Tsunayoshi and Agnes's □□ History

Truth is not frightening. What's frightening is a black rabbit picked up by an alchemist. No matter how aloof she is, if she pushes the black rabbit too far, it can transform into a creature more terrifying than a homunculus, even more terrifying than her teacher, Izumi. This teaches us that anyone living with a black rabbit needs to be tough in both body and mind. And our heroine tells us that she's actually fallen for Sawada Tsunayoshi! In one sentence: The revolutionary tale of 270, who ends up in another world, and a cool-headed but kindhearted girl! A note for readers: Be sure to read this first~~ First, Sawada Tsunayoshi is the male lead. That will not change. Second, the KHR cast will not appear, so don't get your hopes up. Third, the heroine is very composed. There won't be much screaming and ranting. Also, this story follows the manga, so don't bring up the anime plot =.= Fourth, life is miserable, but the story is fun. The author will do her best to write it well. If you spot any plot holes, please point them out without hesitation! Ahem!! (And... don't believe the blurb. It's all lies, hey!!) Fifth, the author has a terrible memory. Please be understanding of a miserable, wing-clipped angel with selective amnesia ╮(╯_╰)╭ Sixth, if this story isn't for you, click the 'X' above. Throwing bricks is very unkind! Please understand that writers are all miserable, wing-clipped angels. Our hearts are fragile. Seventh, have fun reading!! P.S. If you're wary of anything, bring your own lightning rod. If you can't keep reading, click the XX in the upper-right corner. No brick-throwing, please~~ And please don't just lurk without leaving a comment, ahhhhh!!! My profile If you love me, follow me. If you don't, please don't sleep with me. Thank you. My little heart can't take it when you sleep with me and then don't love me - - (P.S. Thanks to Liudao Kulou for making my profile cover, meow~~~). Premise: