Yukiji is found murdered at a hot spring inn and Detective Nagi decides to take it upon herself to solve the mystery. After a number of wrong assumptions, Nagi blames the Voice of the Heavens ("Ten no Koe", i.e. the narrator). Of course, the whole murdered case was just a story that Nagi acted up until Yukiji couldn't stand it anymore, so she used her last resort, and it's called "fanservice". Nagi and the rest of the girls enjoy the hot springs, Hayate is stuck in the men's barrel bath with Eight. Kirika sends another butler to defeat Hayate, and they have a B-Daman battle.