Hiroto stumbles onto something extraordinary while scouting his backyard for the perfect secret base location. Hidden in his family's storeroom is Tonkachi, a ninja influencer obsessed with streaming his exploits online. When Tonkachi learns that Hiroto knows about the legendary Ninja Box, a powerful artifact capable of granting wishes, he drags the reluctant kid into an adventure neither of them expected. Their search takes them to Tatemakuri Village, a place where ninjas operate in secret and danger lurks around every corner. There they meet Tatezō, a wise-cracking dog who somehow speaks human language and knows far more about their quest than he initially lets on. What starts as Hiroto's simple desire for a hideaway becomes a wild ride through ninja culture, comedy, and genuine adventure. This short series balances absurdist humor with real action sequences, mixing a laid-back slice-of-life vibe with genuine stakes. It rewards viewers who enjoy watching unlikely groups bond while uncovering mysteries, all wrapped in a surprisingly wholesome package about friendship and discovery.