Onsen maruhi daisakusen! 4: Noto hantô Wajima onsen wo meguru kyûkyoku no zuwaigani to dentô no waza Wajima-nuri no bi ni kakusareta renzoku satsujin no nazo! (2007)

Satsuki (Yoko Moriguchi), an inn consultant, pursues the case. Satsuki goes to Wajima to help revive Koshuen, an inn in financial difficulties. Then, a companion who worked at Koshuen is murdered. Satsuki learns that someone committed suicide a month earlier at the murder scene, and investigates the connection between the two incidents.