Seiji has just got his allowance when his sister Rin shows up.  Rin takes his allowance but when her tries to get it back he accidentally lets her see Midori.  Seiji can't believe that the last person in the world he wants to find out about this now knows his secret.  Later, Rin's old bike gang show up and they take off to spend Seiji's money on a night drinking.  When she gets drunk Rin shows the bike gang Midori and everyone is amazed at how life-like the "doll" is.  Much later, after a fight ensues of Midori, Rin shows up at the bath that Seiji is in.  Here she tells Midori about how Seiji became as tough as he is.