あとがき / p o s t s c r i p t
As was established in the original series, Seiko is half-American. Her father is named after Peter Payne (of JList fame) and Renton Thurston (from Eureka seveN).

Kana Breakdown:
アタフタ [atafuta] : A literal adverb meaning, roughly, "hastily".
ゴチ [gochi] : Used as a sound effect for a comedic thwack.
まふふ [mafufu] : Peter chuckling in an odd fashion.