This shift suggests that will abandon large-scale Kaiju battles in favor of a duel of wits—a "Shonen Battle" drawn in real-time.
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The magic system has a rule: Every drawn thing has a soul cost. By drawing a sentient "Hero" rather than a mindless golem, Yato may have bound a fragment of his own lifespan to the sketch. Chapter 116 might reveal that the Hero he drew looks exactly like his younger self—a metaphor for sacrificing one’s innocence to win.