Oikawa only knows y/n aka Mikuni as his sister but didn't know that he has another sister (Tomoe) that's a secret who's is living her own life and dating his best friend (Iwaizumi) behind his back. He doesn't know that Hotsuma (♂️, messy blond & green eyes, vampire who only drinks premium blood bags that he buy as he is rich) & Shusei (♀️, long brunette hair & golden eyes, cold sensitive Ajin, pretending to be a human being by wearing warm patches & perfume as hotsuma commented that she smell like a human without knowing that she is not a human, but Ajin, only you know) are together, Yoo Jonghyuk & Han Sooyoung are together, mattsun & Makki are together either about kindaichi & Kunimi being together, kyotani & Yahaba being together cause they are doing everything behind his back.