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Iori, Mako, and Luna?
The three so-called “△×○□ Idol Sisters”live together in a house in Tokyo.
On a weekend, their schedules miraculously overlap.
On that day, they have a special “play” that's just for them.

That is
To summon a hard-specialized livestock host from the Livestock Personnel Dispatch Center and use him to their heart's content.
To replace the mid-level livestock host Kumakuma, who had shown little response,
the three sisters chose a new one:
Shin Livestock Host “Yari”