In the Pink S2, E1: 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...
Fooled into coming overseas by news of his mother's imminent death, high school student Kaido Haru encounters a boy who insists that he's his brother. Haru does his best to raise feral and obstinate Ren, but there seems to be a secret behind Ren's birth. On top of that, just when Ren begins to warm up to Haru, tragedy strikes. Five years later, Haru reunites with Ren, all grown up in Tokyo, but…