takebe saori, nishi kinuyo, fukuda haru, and teramoto tomiko (girls und panzer and 1 more) drawn by gemu555

What did she call it...? Ei... Ei...

I'm certain it was "ei ei ioー!" de arimasu.

That's it!

It's ASMR! Autonomous sensory meridian response. Wikipedia: ASMR

Would you like to try it out, Commander-dono?

Hmm... I don't know what that is, but I'll give it a listen.

Mimi-gokochi? It's the same word, but the Hirgana version is used for ear picks.

Pleasant sounds~ The original connotation is "pleasant for the ears".

Does anyone need some pleasant sounds~

Teramoto, what are you selling?

Commander-dono!

We heard from Takebe-dono that pleasant sounds were popular, so we recorded some and are selling them.