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Warning: This song contains questionable lyrics and themes; it may be inappropriate for younger audiences.
The Vocaloid Wiki does not have a policy on lyrical content or theme; however, it attempts to follow the Wikia TOU.
For further discussion see Thread:68883. Questionable songs are automatically sorted into this category.
The song talks about a forbidden romance between Luka and Len. Among several facts that keep you from getting together, they begin to find hidden. Calling their romance a "Perfect Crime", they say they never left evidence.
The song is featured on the samfree's album Crime. A eurobeat remix is featured in samfree's album Fever.