>>106132904
Everything appealing about Mari has to do with corruption. She's a devout, pious christian girl that has taken the habit and devoted her life to god. But because of Sensei's influence, she leans more and more towards selfish thoughts and actions.
She took on the aidoru gig, not because of the reasons Mine and Sakurako had. She did it because she wanted to stand out and for people to cheer for her. Specially (You).
And then she destroyed all of these pictures except for the ones she gave to Sensei, because the memory of being naughty Mari is only for him.