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Pre-Wedding Mystery Tour is the seventh chapter of the manga Danganronpa Gaiden: Killer Killer. Chapter 7 was published in Bessatsu Shōnen Magazine on August 9, 2016, and later re-published in Danganronpa Gaiden: Killer Killer Volume 2 on November 9, 2016.
The chapter starts off with Asano bathing in a hotsprings, only to be interrupted by a couple of other guests and wonders what she's gotten herself into. The scene then skips to a toast indoors dedicated to Kinari. A flashback is shown, with Asano receiving an invitation from Takumi for a trip; Just the both of them. She wonders if Dogami would reject it but she accepts the trip anyways. Katsuragi reaches out to go with them as well, but is told by Dogami that she has her up for another case. The flashback ends and Asano is interrupted by one of the other members wondering where one of their guests is, in which she opens a room to encounter Takumi grabbing onto her, clearly drunk. He collapses and she leaves to to her room- Flustered by the sight of two beds side by side. Takumi recovers and the group at the table wonders where Takeda went. Kinari opens a room with the others following only to be met with a dismembered corpse. They freak out until Takumi reveals himself to be a Foundation agent, in which the tension is eased a bit.
He reminds the others that it would help for them to stay within the perimeter and not leave the place while the investigation is pending. Tomizawa resists the urge to puke as she stumbles to the bathroom, Takumi following. He asks if she's killed Takeda, in which she confesses with a twisted grin. He explains the method used to murder, stating he knows passionate killings, and her reason to murder was worthless. This enrages her and she charges at him with a sword only to be decapitated. Asano awakes to find the roof gone, with a downed Shuji stating that it was 'Killer Killer's doing. He introduces himself and states that he studied with Takumi during middle school, exposed that Takumi is the Killer Killer and asks Asano a favor to assist him in making Takumi drop his Killer Killer act.
- Nobua Takeda