蝶と花と蜘蛛 (Chou to Hana to Kumo)

Background
At the ball of a certain palace, a daughter of lower class meets her first love (a knight), whom she always thought of. But the knight's master, a young lord has come to like that girl and proposes to her. But as the knight, who had become a loyal servant to the prince had sworn to live only for him, he erases the memories of the girl and kills his own faint romantic feelings.

The girl is wavering between the two boys.

Soon war is about to start, and those three...

...this is their story.

The song is featured in Hitoshizuku-P and Yama△'s album, Polkadodge, and has reached the Hall of Fame. For Comiket 86, Suzunosuke published an artbook featuring a manga based on the song.