Usagi Drop Episode 4 English Subbed Episode Title:Letter.Episode Description:At school, Rin makes friends with a boy named Kouki Kitani, with Daikichi later meeting his single mother, Yukari. Daikichi's workmates hold a farewell party for him, which he brings Rin along to. After enrolling Rin into elementary school, Daikichi looks through her health record and manages to find Souichi's will, containing Masako's contact details. After buying Rin a desk, Daikichi decides to call Masako.