"Stop saying these things so casually. Don't you even feel embarrassed by saying these all the time? You know it. No matter how much you love me, we can never be together. I'm sorry. I can't return your feelings because we are siblings!"

"Since elementary school up till now, I have always loved you. That's all I have to say before I become Miku's... sacrifice." That was what Len said to Rin before he plunged down from her apartment, leaving her clueless and stunned. Because of him, Rin ended up in a whole lot of trouble which would cost her her life. By the way, what did Len mean by "Miku's sacrifice"?