The Introduction Arc

Keiji, a proud and fearless rooster, begins his lone crusade against the kaiju threatening humanity while driven by a personal tragedy he refuses to forget.

The series opens with an audacious premise: a rooster named Keiji stands defiant before a massive kaiju that has leveled an entire city district. Rather than fleeing like the humans around him, Keiji charges forward — and wins. This first encounter immediately establishes the series' absurdist tone while demonstrating that Keiji is no ordinary bird. His fighting technique combines raw physical power with an almost supernatural instinct for exploiting enemy weak points. The arc reveals the emotional core beneath the comedy. Keiji's relentless drive comes from a deep personal wound — his sister Sara, the only creature he ever truly loved, was killed in an earlier kaiju attack while Keiji was powerless to protect her. That helplessness transformed him. Every kaiju he destroys is both justice and penance, a promise kept to a memory he carries in every fight. Piyoko, a young chick who was kept as a pet by yakuza and subsequently abandoned during the chaos of a kaiju attack, crosses paths with Keiji and refuses to leave his side. Despite Keiji's gruff indifference, Piyoko's presence gradually softens his edges — not enough to compromise his ferocity in battle, but enough to remind him why protecting the living matters as much as avenging the dead. By arc's end the manga's central contract with the reader is fully in place: every chapter delivers a kaiju encounter executed with genuine tactical creativity and kinetic action art, wrapped in deadpan comedy that somehow makes the absurdity feel completely earned.