After accompanying Subaru to Nana's apartment to return her key, Haru had an emotional reunion with her younger brother, Hachi. Then, suddenly, a man with a scary face busts into the room! He turns out to be Nana's younger Yugo, and despite his large stature, Haru is relieved to see Hachi and Roku happily playing with him. Then Subaru spots a magazine called Polaris in Yugo's bag—the very magazine that's serializing Subaru's novel.
Oh, yeah! Where the letter 
arrives at the lab...
Ah, genau, da wo der Brief im Labor eintrifft …
Ah, sí. Cuando llega
la carta al laboratorio…
Ah, sí. Cuando llega
la carta al laboratorio…
Ah oui, quand une lettre…
Ecco! L'istituto di ricerca riceve una lettera...
Ah, é! Quando chega uma
carta no laboratório...
До сюда! Где в лабораторию 
приходит письмо...