When Kondou, Hijikata, and Okita came to the modern world, Kondou decided that high school girls rule everything and that is what they will be.
So you put some hot 
springs powder in here.
Oh, ¿le echaron las sales de baño?
Oh, ¿le habéis echado sales de baño?
Então você coloca um "pó de águas termais" aqui.