Click here for the general info of the strategy stage: • おそ松さん Hesokuri Wars: Vampires of Summer St...
Put these on your team: 3 air Ichimatsus, 3 air Todomatsus, and 2 air Karamatsus and they must all be level 40 or above. If you don't have that many air units (in my case, I have one less air Todomatsu), substitute with one or more of the vampires. Air Choromatsus can also be good substitutes. For ground units, you must have Osomatsu and Karamatsu from the Vampire set. Also, the buildings are the most important part of this strategy. You must have the snowy house, the museum with 2 Dayon statutes and the blue and white castle. The non-snowy house can be a good subsitute if you don't have either the museum or the castle. Without these buildings, especially the snowy house, you will be stuck on this stage for more than 40 minutes.
You can stick to a smaller team of 5 air units only, such as 3 air Todomatsus, 1 air Jyushimatsu and 1 air Karamatsu, but it'll take longer to beat the stage. If you only have one air Todomatsu, use him plus 2 air Jyushimatsus. As long as the snowy house and museum with 2 Dayon statutes are used, you will be fine.
Send out 3 air Ichimatsus first and the vampires. Then switch to sending out 3 air Todomatsus, and 2 air Karamatsus. Then switch back to sending out 3 air Ichimatsus and the vampires once your units make contact with the enemy units. After that, focus on sending out only Todomatsu and Ichimatsu until you destroy the enemy base.