Beatiful young lady saw great detective! Case of murdered teacher
The Pretty Lady Detective Saw it! The Hot Spring Female Teacher Murder Case
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 in the sky ("Ten no Koe", i. e. the narrator). Kirika sends another butler to defeat Hayate, and they have a B-Daman battle.