The Romance Manga Artist S01 E05 Her sis shows up, so they pretend to be lovers!? A new Seiichirou!?

Aiko's older sister Ruriko shows up, so Kougo recommends that Aiko and Seiichirou pretend to be in love. Seiichirou initially balks, but Ren is closing in on the truth about the picture Seiichirou drew.