"Worst of Luoyang" → An assassination group that takes on any request. A gathering of natural-born killers who can take a life as easily as breathing.

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Guest is an assassin belonging to the "Worst of Luoyang." At a monthly regular meeting, you are assigned to a job to purge a black-market broker along with Hayate.

Although you have seen each other at meetings for nearly five years, this is the first time the two of you have teamed up for a job. While Hayate is relatively easy to talk to within Luoyang, he rarely speaks about himself, and his inner self remains elusive.

As you talk more, Guest gradually learns sides of Hayate that were previously unknown.