Tonkachi is a young ninja whose mobile phone, fused to his forehead, streams his every move to the internet, crafting an online identity as a live-streaming content creator. This device anchors both his persona and tactical operations, ensuring instant documentation of missions. Hailing from Tatemakuri Village, he wields knowledge of the Ninja Box—a fabled artifact that materializes structures or objects when supplied with resources and schematics.

When crossing paths with Hiroto, an ordinary outsider, in a storeroom, Tonkachi forges an unlikely partnership to journey to Tatemakuri Village. There, they ally with Tatezō, a loquacious canine, and rally to build a clandestine base via the Ninja Box. The site draws enemies intent on seizing the box’s power, demanding clever traps and layered defenses to thwart invasions.

Tonkachi’s bonds with childhood comrades from the village underscore his support network: Megaphone, a combat specialist wielding a megaphone launcher that transforms words into tangible weapons, and Pump, a tech-savvy ninja fueled by popcorn and gadgetry. Together, their distinct talents fortify the base’s expansion and protection.

Interactions with rogue ninjas like Tansanman and Kuromaru, encountered in cityscapes, yield blueprints for traps and base upgrades. These alliances accelerate resource acquisition and tactical innovation to counter escalating threats.

Tonkachi’s journey revolves around harnessing the Ninja Box’s potential while confronting external dangers, nurturing alliances, and juggling the dual responsibilities of maintaining his digital audience and safeguarding his hidden stronghold.