SONE-414 falls under the or "Hidden Camera Reality" sub-genre, a staple of S1. The premise: Miru plays a reserved, serious nurse who has never been able to relax or enjoy intimacy. A director convinces her to participate in a "stress release experiment" – but the cameras are hidden, and the situation gradually escalates from therapeutic to coercive. The twist is that Miru’s character slowly realizes she enjoys the loss of control, creating a psychological arc from resistance to reluctant acceptance.
Thus, a Sone 414 rating of (which is mathematically common) sits exactly at 60.5 dB(A) — the threshold where two people must raise their voices to speak over the fan. sone 414