Ep. 5: Nasa and Tsukasa navigate the complexities of purchasing an affordable diamond ring for their engagement.

Nasa and Tsukasa visit an electronics store to shop for a TV. Later at the bathhouse, Nasa tells Kaname about his verbal commitment to Tsukasa, after which she tells him that it is important for him to buy an engagement ring. After leaving the bathhouse, the two stop by at a nearby park and kiss while Charlotte and Aurora secretly observe them. That night, Nasa learns the difference between engagement and wedding rings. Afterwards, Nasa insists that he has to buy a diamond ring. The next day, the two go shopping in Omotesando, and Nasa is shocked at the price tag for a Honey Winston diamond ring, but is talked into buying one until Tsukasa drags him out of the store. Tsukasa tells Nasa that she does not want him to spend his savings on a ring. Instead, the two stop by at a jeweler in Okachimachi with affordable diamond rings but the price is still too much to get Nasa to understand. Eventually, they end up buying a pair of cheap diamond rings and Tsukasa expresses her appreciation on their way home.

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