In Detective Conan, Just Like When We First Met

Male lead: Gin (Jin Kurosawa). Female lead: Sang Lujiu (Yi Ruchu).

No System. The heroine transmigrates into someone else's body. She has only heard of a few Detective Conan characters, and doesn't know the story.

The protagonist isn't invincible. She's cold toward everyone except Gin and only cares about him, not whether anyone else lives or dies. She's fairly weak at first, only a little stronger than an ordinary person, but very clever. She'll change later on. This isn't a wish-fulfillment story: there are sweet moments and angst. If that's not your thing, feel free to leave, but please don't criticize others in the comments. I don't like that sort of behavior. The author is sensitive, and my writing isn't very good either. This is my first time writing, and I didn't handle the heroine's personality well at the beginning.

“Jin, I heard that couples who ride a Ferris wheel together eventually break up. But if they kiss when the wheel reaches the top, they'll stay together forever. Let's ride one together. I want to be with you forever.”

“Okay, let's ride the Ferris wheel. Wherever you are, I'll find you.”