孤独≒エゴイズム (Kodoku≒Egoism)

Background
The song was first uploaded on June 7th 2012. It is Rohi-P's 4th original Vocaloid work; and is among one of his most notable works the others being "Hitotsu no chikai yo, eien no uta to nare" and "Ichiru no nozomi yo, ano tsuki e hibike"; both sung by Kagamine Len and Rin.

Kodoku Egoism made it way up to the top and stayed in the weekly ranking for two consecutive weeks. Rohi-P stated she wanted to make a pop-gothic influenced song, thus the PV and lyrics depicting so. The story is basically Rin, asking "you" questions whether you're happy or you're faking it (which she believes so)