おおば湯を本格的に立て直すべく、いろいろな銭湯に通って研究を始めた七苗（川口春奈）。コウタロウ（松下洸平）とも思いが通じ合い、満ち足りた日々を過ごしていた。
その頃、離婚が成立した六月（木南晴夏）が家を引き払って実家に戻ってくる。さらに、あつ子（YOU）とコウタロウが住んでいるマンションが水漏れの被害に遭い、修理の間七苗とコウタロウが同居することに･･･！
そんな中、あつ子から招待券をプレゼントされた八海（畑芽育）は、陽太（木戸大聖）への気持ちを伝えようと、アミューズメントパークへ出かけることにするが…。
In order to rebuild Obayu in earnest, Nanae (Haruna Kawaguchi) began her research by going to various public baths. He also shared his feelings with Koutarou (Kohei Matsushita) and spent his days feeling satisfied. Around that time, June (Haruka Kinami), who has been divorced, moves out of the house and returns to her parents' house. In addition, the apartment where Atsuko (YOU) and Koutaro live is damaged by a water leak, and Nanae and Koutarou will live together while it is repaired...! Meanwhile, Hakkai (Mei Hata), who was presented with an invitation ticket by Atsuko, decides to go to an amusement park to convey her feelings for Yota (Taisei Kido).
