Setoro frequents the Time of Eve cafe as a regular patron, invariably engrossed in reading during his visits. His reserved and quiet demeanor cultivates an aura of mystery. When Masaki pursues him beyond the cafe to discern whether he is human or android, Setoro adeptly evades detection, displaying acute awareness of the establishment's privacy and non-discrimination rules. This evasion reflects his deliberate commitment to upholding the cafe's ethos.

Confirmed as human, Setoro remains the sole human regular customer portrayed at the venue. His unwavering presence and strict adherence to the cafe's foundational principle—rejecting distinctions between humans and androids—embody its envisioned environment of equality. His conduct consistently reinforces the cafe's purpose as a sanctuary fostering mutual respect.