We might want to go back to the underground to get backup, now that we know where Koishi might be. Even with the strongest fairy at our side, this Reisen and the Bamboo Forest sounds like a big deal. Maybe Yuugi would be interested in splitting the reward.
Heck, it would be pretty interesting if we could get a whole party together: Yuugi, Cirno, Mokou, Mrs. and Mrs. Kamasho... Kamisuwa... ... Mrs. and Mrs. Aki, and Kaguya would be a formidible team. Maybe.