1화: 하루마는 자신을 여동생이라 주장하는 소녀를 맞이하고 그녀를 초코라고 부른다.

1

College student Haruma is stunned when a girl stated to be his sister is delivered to his apartment. Unwilling to evict her, he names the girl Choco, because she is constantly referring to her guide book (chocotto being Japanese for 'manual'). Haruma takes Choco to the mall to buy her clothing, but they lose sight of each other inside. (Source: Wikipedia)