
Malootrager
I had this funny idea of a couple of characters in your story, a grandpa and his grand son who are tank mechanics who service and repair tanks for the schools and universities, it turns out the grandpa knows about the problems and troubles of the other two great Sensha-do families. Kenji and crew need new parts for their tanks for the upcoming match with Kuromorimine so they head to the grandpa and gand son work shop for these part

Malootrager
When Kenji told the list of parts need grandpa asked what's the reason for so many parts and when Kenji mentioned their match against Kuromorimine by using Minori's family name grandpa froze hearing the name, he asks Kenji his connection to the family and was shocked by the response and the death of last child of the family