Episode 3:
Sakura is best girl
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Episode 8:
Firstly, how do people even drop contact lenses? Secondly, he dropped one lens, meaning he should be able to see with one eye. Thirdly, can you really use the dropped lens?
Episode 10:
I remember reading somewhere, that if you like a person's smell in "normal" conditions and without any perfume or what not, it means you are chemically compatible. No idea if there is any truth to that.