Len Kagamine has a crush on a pretty girl name Rin! But as he loves her, he turns into a yandere and kills everyone who dares to hurt her or block his path to her. But then one day, he realized that he has an arch nemesis name Mikuo Hatsune who also is in love with Rin and he's the MOST popularest and the cutest student of the high school! His little princess was so popular he had to pick them all off with a stick, but Len didn't, it was his job as her brave knight to protect his lady from such filthy people. WARNING: This contains gore and blood and....r**e. But I tried to make it harder for little kids to understand.