It's May in Aoi's second year of university, and to celebrate her twentieth birthday, she and Kiyotaka take a trip to Kyushu on an extravagant overnight train. As they're enjoying their vacation on rails, they run into Shiro Amamiya, one of the people involved with the drug cult in Ohara. He has two stolen hanging scrolls on him, which were supposed to have been sold at an overseas auction! In order to reclaim their friend's paintings, Aoi and Kiyotaka find themselves taking on a new investigation. The mysteries continue in Holmes of Kyoto: Volume 10!
