Hooded dude(mastermind) is actually just messed up in the first place, and has been obsessively collecting "mementos" of Mika since a year before. Been that way since way back, since he's been doing it to other girls as well. Meanwhile, hooded guy(accomplice) got involved because he got caught getting a good ol' sniff of Mika's shoes... that apparently tastes like sake lee (left over lee from sake production) and miso, according to the mastermind... yup.