Just a heads up, I don't know very much about the Kancolle or Azur Lane series, just what I've seen through trailers and a few Google searches. The story involves a girl who gains the ability to equip multiple ship armor from the Kancolle and Azur Lane series so she can wear one characters armor who let's say has torpedoes as a weapon and then she can switch to another character who has multiple cannon turrets or you can imagine new armor not found in the series, and with a special skill she can summon the ship or a part or parts of the ship her current armor is based off for a certain amount of time for example she could just summon one or two of the battleships turrets and fire them or she could summon the whole ship getting the whole package from multiple cannon turrets as well as any other weapons it may have all at the same time for massive firepower but the cost for doing this can be stamina, mana, or it could even be on a timer or maybe no cost at all its up to whoever writes my idea into their own story. For armor I thought each armor would have different stats like the characters in the series for example I wouldn't think a big aircraft carrier would be able to move faster than a light cruiser so the same would hold for their armor and also as an added bonus I think besides just floating and gliding across the sea like in the Kancolle and Azur Lane series I think she should also be able to glide across land as well or else she pretty much would lose a lot of mobility on land if it could only work on the sea you get the idea. For worlds, I think One Piece could be cool or a Medieval fantasy world. In One Piece, I think she wouldn't be to op, and in a Medieval fantasy, she would probably be very op.