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Artist's commentary
BBB
It is an unfortunate BBB who only has a name but does not appear in the EXTRA CCC and the FGO collaboration event.
Probably an innocent and ignorant child, a child who is honest and can grow if praised. There is almost no BB element of the producer in the personality...
If you are called by Chaldea for some reason, it seems that he will follow you like a karugamo chick while grabbing the edge of the master's sleeve.