Yasu Appears! Room No. 707 (ヤス登場!707号室 Yasu toujō! 707 gō shitsu) is the seventh episode of the Nana anime.
Nana O. and Nana K. are going to meet once again. The two decide to share an apartment, splitting the cost of the rent. While waiting for Shoji from work, Nana K. creates in her head imaginary rival Sachiko. Imaginary Sachiko is Shoji's beautiful lover, who loves luxurious gifts. Thinking about her, Nana K. recalls times when she was Asano's lover, despite the fact that he has a wife. Shoji suggests Nana K. to live with him, and she is very happy about that, but she refuses, because she is affraid to lose him to imaginary Sachiko.
Shoji, Junko, and Kyosuke at first are against the idea of Nana K. sharing the apartment with someone they don't know. Nana K. invites the three over to the apartment, meeting Nana O. and Yasu, who is helping her settle, there. After learning that Yasu is a lawyer and is capable to take care about everything, Nana K.'s friends leave. Both Nanas begin their lives together.