On school festival day, the gang sells a ton of rice balls thanks to an innovative Prince Yuki marketing technique. Bonus: two other members of the Soma family come to the festival to introduce themselves.
Word on the street is to never 
underestimate Wave Girl.
Das Wellenmädel soll man
besser nicht unterschätzen.
Dicen que nunca subestimes
a la chica de las ondas.
Il faut pas sous-estimer
la nana aux ondes.
Não é bom subestimar
a Garota das Ondas.
Девка с волнами — та ещё заноза.