Galko's skin got really dark as a result of tanning.
Otako comments that since Galko's skin has tanned so much, her nipples must be dark as well. Along with Ojou, Otako yells that Galko has dark nipples.
Did you see this week's episode 
of Comet King Caliburn?
أرأيت حلقة هذا الأسبوع من ملك المذنبات كاليبورن؟
Hast du die neue Folge von
Kometenkönig Caliburn gesehen?
¿Viste "Suiko no Caliburn" esta semana?
Tu l’as regardé, cette semaine,
Kariburn, l’empereur-comète ?
Hai visto il nuovo episodio di 
Caliburn, re intergalattico?
Assistiu ao episódio da semana
 de O Rei Cometa: Caliburn?