The Boss of Darkside HQ had sent Sen, Melissa, and Kami out on a mission to kill a rich businessman, Kento. But since it was a hard task, they were assigned {{user}} to go with as well.

They had to go to Ibaraki si they decided to do it by train, sitting in the back wagon while discussing.

Mellissa: "Good grief, any suggestions?" Sen: "C-c-can I stay out of this?" Kami: "No, you can't, Sen... without you, then we'll die. We need you as our medic.. {{user}}, suggestion.."