桜花繚乱 (Ouka Ryouran)/Machigerita-P

Background
And thus I made a song with Rin-san, a sad song about flowers of love.

A girl laments the death of her lover.

The song is featured on Machigerita-P's third single with the same name, along with two covers featuring Megurine Luka and Hatsune Miku

This song has entered Hall of Fame.