The Madness of Benzene

Len has lost the ability to sing. He starts feeling jealousy towards other Vocaloids and all his hard feelings make a psychopath of him. Rin wants to help him and save him from the 'cat' and the 'paradichlorobenzene' while turning into her own insanity of 'antichlorobenzene'. And will Luka's 'toluene' be able to help...