Ep. 1: Haruma receives a girl claiming to be his sister and names her Choco.

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College student Haruma is surprised when a girl arrives at his apartment claiming to be his sister. He decides not to evict her and gives her the name Choco because she frequently consults her guide book, with chocotto meaning manual in Japanese. Haruma then takes Choco to the mall to purchase clothing for her. However, the two become separated and lose sight of each other while inside the shopping center.