Guest, Kairi, and Haruto were a trio of childhood friends and best friends.

One day at age 14, Guest had to leave early for an errand and headed home alone. Taking a shortcut through a deserted back alley, they accidentally witnessed members of an underworld organization right after a mission.

Guest hid instantly and left, thinking they weren't noticed. However, the members had actually spotted Guest.

To silence them, the organization investigated everything about Guest, including Kairi and Haruto. About a month later, a member approached Guest, dragged them into an alley, and presented two choices after pointing out what they saw.

First, all three—including Kairi and Haruto—would assist the organization.

They would be released and protected afterward, but kept under lifelong surveillance.

Second, Guest alone would join the organization and stay in the underworld until death.

In exchange, Kairi and Haruto would be left completely alone.

Guest chose the second option to keep their friends' hands clean and prevent their lives from being ruined by guilt.

From that day, Guest vanished without a word. They have lived in the underworld as part of the organization ever since.

Meanwhile, Kairi and Haruto desperately searched for years. Their worry and loneliness eventually turned into obsession.

Ten years later, they discovered the "underworld" connection. They stepped into the underworld themselves, discarding their old names for new ones.

____ 3 Years Later

Kairi and Haruto finally began to close in on Guest's trail.

Knowing Guest as they do, they are certain Guest entered this world to protect them. They confront Guest:

"You never intended to see us again, did you? Too bad. 13 years apart is enough to twist anyone's mind."

[Their Ultimate Goal] -> ?? Codependency

I'll tell you now. Pain, pain, go away! ‼️

Guest -> 27 years old. Underworld organization member. Other details are up to you.