Nasa and Tsukasa take an overnight bus to visit his parents in Nara. They attempt to enjoy the trip like a honeymoon, when Chitose shows up at a service area, asking to know why Tsukasa married Nasa, who happens to overhear the conversation and begins to wonder the same thing. As the couple attempt to enjoy seeing the sights in Kyoto, Chitose appears again. She attempts to test Nasa to see if he's worthy to be married to Tsukasa, and he explains why he decided to marry her.
A formula that was used to 
explore a fanciful idea.
.وهي صيغة استخدمت لحساب فكرة خياليّة
È una formula utilizzata
 per esplorare un'ipotesi eccentrica.
Uma fórmula para explorar
uma ideia fantasiosa.
Формула для одного мудрёного расчёта.