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Artist's commentary
GuP Kindergarten Returns! Story 395 - Visiting Day Part 2
It's a large group of non-canon mamas that have appeared in prior episodes.
English:
Katusha's mother is not easy to come by.
Darjeeling's mom said. Let's play with 'aunts' until Katusha-chan's mom comes."
By "aunts" she meant mothers other than herself.