That the other person already liked you to begin with.

EHH!!??

*rumble*

*rumble*

T-that can't be right!

Yeah Rinnosuke-san!

E-even Reimu, what's wrong...?

Even if you say that, I can think of nothing else.

They must already like you so much, to the point that the medicine had no effect. Don't you think?

*stunned*