Well Rikuna and Isabella confuse me as well
Rikuna appeared out of nowhere in the school , and has connection with Kenichi yet treat MC like he is her prince or something like that, there is the incident in the showers... the scene where she manipulates Shinji , and probably she has some sort of role in the Zaibatsu corp because i suspect she is George's assistant...
Isabella on the other hand is supposed to be a shaman woman, but she has her own hidden agent and that much is clear since she tried to use MC ... She hypnotised the MC and wanted to steal info from him... Hell he almost admit his real name, that makes her completely dangerous on my book..Tomoe on the one hand the first 2 days we have return is cold as ice towards the MC until the moment she peak on him during his bath...after that moment and adding her missing dildo and George being away she starts to get horny and frustrated....
Rikuna as George assistant - but why Zaibatsu? George is news magnat, he have some newspapers through which he can blow on scandal about MC's dad.
Rikuna - on one hand, she is a long-time servant of Rachel, and therefore should not help Isabella to find out information from the MC regarding Rachel. but she took an active part in the session... wait - so it must have been she who broke the pentagram on the floor, sabotaging it. then everything fits together, why was she at that MC hypnosis session. it's so obvious.
but I thought that Elizabeth broke the pentagram.
Rikuna treated MC as prince of something because of Rachel's task. Rikuna's loyalty is for Rachel and not for MC. hmm...
...and maybe for MC if he received Rachel as his sensei (i mean "it is good to be bad")