Yūto, Haruka, Mika and Nanami become increasingly worried about Hazuki's attempt to distance herself from the family and thus decide to follow her on a shopping trip, meeting up with various familiar faces like Yūto's otaku friend Nobunaga, Yūto's sister Ruko and their teacher Yukari. Mika and Nanami eventually becomes distracted in buying lingerie, leaving Yūto and Haruka to the job and almost came to a conclusion that Hazuki was about to get married and quit her job. Before going home, they had a misunderstanding with a bridal shop where they are thought to be customers and were given a chance to take a portrait together with Yūto wearing a tuxedo and Haruka in a wedding dress. That night, Hazuki, much to everyone's relief, explains that she is not quitting, but was just going to a hardware store, which was located above the bridal shop, to fix her chainsaw.
葉月の様子がどこかおかしいと心配する春香。裕人は気のせいなのではと答えるが、美夏や那波も葉月の様子がヘンだという。そこで、ちょうど私用で出かけた葉月を尾行することにした裕人たちは、葉月がブライダルショップのあるビルから現われた男性と親しげに話しながら、その店の中に入るところを目撃してしまい…!?
하즈키에게 고민이 있다고 생각한 하루카는 유토, 미카, 나나미와 함께 하즈키를 미행하기로 한다. 백화점으로 들어간 하즈키를 쫓아서 들어가 보니 하즈키는 여성 속옷을 판매하는 매장을 구경하고 있었는데...
