Some information from Japanese local competition (cf. qualification for Nationals)
After the 1st part of the sectional qualification, the following Sr. women will advance to National:
Rinka Watanabe (also gets to Winter Universiade), Yuna Aoki, Akira Matsubara, Tomoe Kawabata, and...Marin Honda.
Yes, only 5 will advance (along with Wakaba as the exempt skater, Satoko the seed skater).
For the side story about Marin made it to the National, she said in the post-interview that she got a chance to practice with Mao Asada after the regional competition (probably through her current coach: Marin now trains with Sato coach). Marin said Mao gave her a lot of encouragement, by telling her that a lot of ppl still want to see Marin's skating.