| + Kurumi Asako |
Asako is a sort of older sister figure to Sana. However, Sana viewed her as a "rival" when they first met. She thought Asako was going to steal Rei from her, but eventually realized how much Asako and Rei cared for eachother. Sana swallowed her pride and embarrassment and gave the two of them her blessing. Afterward she and Asako become closer. They work on several projects together. Sana goes to Asako for "girl talk", and Asako even buys Sana her first bra.
| + Zenjirou |
Sana works with Zenjirou on the tv series Child's Toy. They most often see eachother in "professional" settings (of course they never behave professionally), such as commercials, though Zenjirou does seem to pop up in all sorts of odd places. Zenjirou is usually just around for humorous purposes, but Sana is genuinely nice to him. At one point she throws him a birthday party, and even makes him a gift.
| + Hayama Natsumi |
Natsumi did not make the greatest of first impressions on Sana; she was calling Hayama (Akito) a demon child at the time. Even so, Sana was still extremely kind and polite to her - she even managed to get Natsumi and autograph from Zenjirou. Sana took it upon herself to change Natsumi's attitude towards Hayama, with the help of the tv movie she starred in. Sana succeeded and Natsumi saw the error in her ways.