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Artist's commentary
GuP Kindergarten Returns! Story 315－Sandbox Continued, Times 11
Don't use other person's things without permission.
Source: https://twitter.com/s4_black/status/1485095622802022405
English:
Chiyomi wanted to use Kachusha-chan's sandbox tools. However, she remembers her mother telling her, "You can't use other people's things without permission.
Instead of using Kachusha's sandbox tools, she washed them and put them back in her locker.
Source: https://twitter.com/s4_black/status/1485095894634864640