The quest is unlocked after completing the Each Step Like Thunder scenario.
"Master Kohga plans to eat ice cubes so he can harden his body and spirit and achieve his truest, manliest form. But he needs warm stuff to settle his stomach...and syrup to flavor the ice!"
"Master Kohga could feel his body and spirit hardening...but he could also feel an uncomfortable chum in his stomach. Gah! Perhaps he shouldn't have mixed cold ice with warm ingredients..."
- Master Kohga: Bonus Combo