Ep. 6: Welcome Party and Water Gun
Ipinalabas noong Mayo 9, 2018
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". (Source: Crunchyroll)