Pickled radishes are still pretty effective against Akari.
Chitose's thinly-plotted solo mode:
Bout 1: Akari - Chitose notices Akari and agrees to fight her so she won't feel left out of the tournament.
Bout 2: Himawari - Chitose needs someone to cover her share of the paperwork while she goes out to try to help Ayano confess her feelings to Kyouko.
Bout 3: Sakurako - Sakurako is upset that Chitose challenged Himawari and not her, so she insists on fighting.
Bout 4: Rise - Chitose needs permission to leave the student council in order to help Ayano and Kyouko get together. She can't make out what Rise says, so they fight instead.
Bout 5: Chinatsu - Chitose needs to get through China to get to Yui.
Bout 6: Yui - Chitose needs an ally to make Kyouko listen to her.
Bout 7: Kyouko - Chitose must make Kyouko swear to say yes if Ayano asks her out.
Bout 8: Ayano - Chitose must force Ayano to confess, by force.
Bout 9: Chizuru - Chizuru wants to keep Ayano and Kyouko apart, Chitose must silence her with kisses.
What would the order be for the other poorly-linked solo tournaments?