Rookie police officer Keita Osaki is assigned to Sakakicho, a downtown area of ​​Tokyo, which seemed far removed from the Knockers crimes that were causing a stir in the city. However, one night, when Keita and his colleagues rush to the shopping district after receiving a report, they encounter a Knockers criminal who is destroying buildings with overwhelming strength. Undeterred by the gunfire of the police officers, the Knockers attack and take down his colleagues one after another, leaving Keita in a desperate situation when someone speaks to him. This person, who introduces himself as the local deity Kurando, says that if Keita makes an offering and "wishes," he will lend him his strength. Keita reluctantly agrees and merges with Kurando, becoming his vessel and being absorbed by Kurando, who has transformed into a giant armored warrior. With his astonishing abilities, Krand repairs the destroyed town, heals the seriously injured, and even easily defeats the violent Knockers criminals. However, because of his strength, Sakaki Town is nicknamed "the town of no return," and fearless Knockers criminals gather there.