Sonoa gets drunk and ends up living at Tachibanakan. Yuu gets everyone to have a welcome party for Sonoa, so they meet by the riverside in appropriate outfits. Yuu has water guns waiting for them, and has everyone enter a "Water Gun Survival Game".
I'm not letting Yoriko-oneechan's 
death be for naught...
Yoriko-oneechans Opfer
wird nicht vergebens gewesen sein!
Hermanita Yoriko,
tu sacrificio no será en vano.
Hermanita Yoriko,
tu sacrificio no será en vano.
T’es pas morte pour rien,
Non lascerò che
 la morte di Yoriko sia inutile...
Não deixarei que a morte da
Yoriko-oneechan seja em vão...