While G. Lunariam and his group were giving special training, the inventor, "Lunar Bath XIII," was enjoying his vacation.
He calls Katsuma to enjoy it even more, and when he is alone, Lunar Bath begins to serve in a good mood.
However, it wasn't just the way it was done ...!
And finally, even Hekaterina reaches out to Katsuma ...!?

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Episodes: 2