Sana is Takumi's younger step-sister by one year who lives with him, though there is no blood relation between them. She most often has an active personality when awake, though still has problems getting up for school during the week despite now being in high school. Her best friend is Chiwa Amano who hangs out with her constantly.

&ldquo;Is there any girl you love?&rdquo;<br><br>
Through these words his friend asked during a school excursion, Kaizu Takumi became aware of his interest in the opposite sex. Of course, there have always been girls around him, like his childhood friend Hatano Konami, his classmate Ebizuka Shino, popular school idol Shimazu Kakana etc. However, he never noticed his feelings until he was questioned by his friend. After growing anxious seeing his friend try to find a girlfriend, he resolves his mind to find a girlfriend of his own during his last summer of high school life.
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(Source: Anime News Network)

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Short specials involving the characters from the main series.

Sana Kaizu