背徳の花 (Haitoku no Hana)

Background
"Immorality of flower" is an original song by Hitoshizuku-P and Yama△. It was uploaded to YouTube on January 20, 2015.

The lyrics describe the story of an officer who is taken to the red-light district to see a popular dancer. He gets intoxicated, and falls in love with her. The dancer reciprocates his feelings. Imagery of flowers, butterflies and poisoned nectar are used throughout the song. From the start, they know their relationship is wrong and doomed, but share a short time of passion. They share whispers and vows of undying love, all the while fully understanding that they can never be together, and eventually confess that they wish they never met, because they love each other too much to turn back. At the end of the song, the couple part ways wistfully, swearing not to look back until they met again, if they were to meet again.

This song has entered the Hall of Fame. It is featured in the albums After the partY and Shuffle!!2.