It's been three months since Haru's dream to live under the same roof with all three of his brothers came true. However, the situation at the Kaidou household suddenly becomes stormy when Haruko announces she's taking Ren back to Switzerland with her. Even after Ren hears about Haruko's secret loneliness from Miki, he still wishes to stay in Japan as long as Haru wants him. But unable to express his desire in words, Ren continues to remain "just a brother" to Haru...
I'm no substitute for her real son.
Ich kann dich als
richtigen Sohn nicht ersetzen.
No sustituyo a su verdadero hijo.
No sustituyo a su verdadero hijo.
Je ne pourrai jamais te remplacer, 
toi, le vrai.
Non posso sostituire il suo vero figlio.
Não sou substituto para 
 o filho verdadeiro dela.