EPISODE CONTEXT

Following Episode 3's emotional farewell and departure, this is the true beginning of Riko and Reg's physical journey into the Abyss, transitioning the season from its Orth-based worldbuilding phase into active descent and survival. As Episode 4 of 13, it sits at the early edge of the adventure arc, establishing the rules and realities of Abyss exploration before the deeper, more harrowing layers demand far greater sacrifices. The encounters and dynamics introduced here lay critical groundwork for the escalating challenges and emotional stakes that define the season's second half.