Mayumi climbed the fire escape of a mid-rise building on the east edge of the commercial district. The monster had passed through here an hour ago, leaving that familiar pressure in her chest. From the rooftop, she could see four major streets and the subway entrance where the creature had stopped to feed. She tested the roof access door. Locked from the inside, which meant no one could interrupt her. The apartment building gave her clear sightlines to three hunting zones where monsters moved between the industrial sector and the waterfront. She marked the location in her phone and set up a watch rotation schedule. This rooftop was hers now. One vantage point secured meant one less blind spot in her city, one step closer to mapping every creature that crawled through Ichiban City's streets.

Mayumi returned to the rooftop three nights in a row. The first night, she counted seven monsters moving through her zones. The second night, five. By the third night, only two passed through, and both stayed far from the building she'd claimed. The creatures were learning to avoid her. She needed fresh territory. The collapsed building near the waterfront had been on her list for weeks, but she'd avoided it because the floors looked unstable and the support beams hung at angles that made her think twice. Now she didn't have a choice. She crossed the industrial sector just after midnight, stepping through the building's shattered entrance. The floor creaked under her weight. Something moved in the darkness three levels down, visible through a gap where the concrete had given way. She knelt at the edge and watched a creature with too many legs pick its way across the rubble below. It stopped. Turned toward her. She didn't move. After a long moment, it continued across the basement and disappeared through a crack in the foundation. Mayumi marked the location in her phone and added it to her rotation. The building was a deathtrap, but it was hers now. One more place mapped meant one less place for monsters to hide.

Mayumi stood on the rooftop when her phone buzzed with alerts from three different zones. Three distinct signals, three separate creatures, all converging on the waterfront at the same moment. She checked the timestamps twice. Not staggered arrivals. Simultaneous. She moved fast, cutting through the industrial sector toward the waterfront. The cement beneath her feet showed fresh marks—massive gouges carved deep into the surface, all angled in the same direction. Three sets of claw marks, three different sizes, all pointing toward the water. She crouched beside the deepest set and traced the edge with her finger. The concrete was still warm. These creatures had moved together, coordinated. They weren't hunting alone anymore. The warehouse sat at the convergence point, its metal roof split into three jagged sections like something had torn it apart from above. Wooden crates lay scattered across the rubble in a pattern that made her pause. Not random destruction. The crates formed a rough circle around the building's center, each one positioned at equal distances. She stepped inside and found the floor unmarked. Whatever had happened here, the monsters hadn't been fighting. They'd been meeting. Mayumi pulled out her phone and photographed the arrangement, then added new markers to her map—not hunting zones this time, but gathering points. If monsters were organizing, she'd need to track their assembly patterns the same way she tracked their feeding routes. One more system to build. One more way to map the threat.