The Protagonists Are All Telling Me to Take My Medicine

After waking up, Sugawa Gen, the big boss villain of a classic shoujo manga, finds the world has changed—he's transmigrated to the world of Detective Conan, and his body and assets have shrunk.

At the same time, his body seems to be infected with a virus that triggers after a short period, and the triggers are becoming increasingly clear:

Forever Elementary School Student: Hello, big brother!

Sugawa Gen vomits blood and faints

Curly-haired, handsome police officer: Don't worry, I'll always be with you.

Sugawa Gen vomits blood, barely conscious

Silver-haired killer: Heh, brat, you've already become such a mess?

Sugawa Gen vomits blood and faints

Finally, Sugawa Gen, pale from blood loss, sneers and shuts out the protagonists who are urging him to take his medicine—

Heh, you triggers don't deserve to say that!

Each seemingly unrelated character is a crucial pivot point of the world. When everyone plays their role well, what changes will occur in the world line?

[This is the beginning of chaos—

Due to stumbling upon a world anchor point, everything will descend into chaos.

New cases, new factions, new understandings.]

(Changed the synopsis, the original one was a bit unclear.)

How should I put it? I implore everyone to bear with the childish style in the early stages. As a novice author, my writing style in the beginning was unstable and had quite a few flaws. I apologize! However, it doesn't affect the reading experience. I'm a plot-focused writer, and my grasp of romance is relatively weak.