Yume has a full 24-hour night/day cycle, and each 24 hours is split into 6-hour “seasons.” The flood occurs every night in Autumn and Winter (the Seikai half-cycle), and recedes each day in Spring and Summer (the Kōkai half-cycle).

Summer

During Summer, Yume is fully immersed in the Kōkai, the spiritual plane. Shinju glows a radiant green, its canopy thick with verdant foliage and its life-giving power is in full effect. The entire city is overrun with life, vines, trees, grasses, flowers, whole biomes basking in Shinju’s power. Spirits can be seen roaming freely in both the Nimbus and Ne-no-Mori.

Autumn

During Autumn, Yume transitions from Kōkai into the material realm, Seikai, casting the world into a deep crimson twilight. The skies shift to ember hues, and energy pulses through Shinju’s roots as it braces for the flood. In Ne-no-Mori, entire neighborhoods raise watertight barriers or retract into stilted towers as the rains begin to pore down. A rising tide of black water, rain, and spores begins in Autumn, drowning the lower ends in neon-lit haze. Spore vents hiss like breathing lungs, and fungi begin their bloom. It’s a tense, liminal time—filled with omens, cyber-rituals, and last harvests before the night deluge.

Winter

Winter is a season of survival and adaptation—cybernetic umbrellas bloom like flowers, and amphibious drones hum through submerged alleys. Dwellers, half-awake and spore-drunk, flock to night markets and underground sanctuaries where data, dreams, and memory are traded like currency. Amid the chaos, electricity rains supreme and the effects of the floods are at their hight.

Spring

During Spring, Yume returns to the Kōkai realm, and the world begins to breathe again. Waters drain from flooded districts through spiral roots in Shinju’s base, revealing mossy stone, rusted tech, and sun-starved gardens ready to flourish. The night-time effects recede and radiant light fills the city, allowing Shinju power to come into full effect and living architecture thrives.