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".
Hanabi...
Hanabi …
Hanabi.
Hanabi.
– Hanabi.
– Non, au secours !
Hanabi...
Hanabi.