after watching Girls und Panzer I had this plot bunny but sadly I feel that with my lack luster skill at writing has made me swallow my pride and offer it up for people better than I, A story that combines the elegance of female tankery with the discipline of male infantry:
the list of characters are simple yet complex: the leads of course are the mains of their respected anime but also add others for the different school like st. gloria and saunders
it's dangerous to go alone!: ww2 weapons only, keep it simple and easy to follow
the common enemy: "them" because of the increase in armaments for the hero you may increase the lethality of your monsters i.e. t-virus, left for dead, so on and so forth
add to the pot: If you want other characters from other titles that is fine! just give the creator his/her due
OC's: bring them on just dont have mary or gary sues, hold poles for them for all roles: teachers, instructors, the grunts etc.
the other clubs: the students from the other clubs can help cross train the different units, seako can teach the tank and infantry commanders the sword Manuel and how to use it for martial purposes
Lastly: have fun, stay safe and let me know when you publish because I definitely want to read