Jinpei Matsuda was originally a member of the Tokyo Police bomb squadron. His partner Kenji Hagiwara was killed four years previously by a serial bomber in Shinjuku and he had sworn revenge on the police for the accidental death of his partner. When the killer resurfaced three years ago, Matsuda's superiors, fearing that he would become reckless due to personal interest, transferred him to Megure's department, where he was promptly partnered with Miwako Sato, then a rather new detective. ~!Matsuda's death haunted Sato for years to come, as she had fallen in love with him, and she kept his final message on her cell phone as a reminder of him. When the bomb killer was finally caught by her and Takagi, she managed to put behind the haunt of her past, though she promised herself never to forget about Matsuda.!~
