This is just my opinion I think tsukasa saying amane killed him because tsukasa sacrifice his life to save amane and amane blamed himself for tsukasa's disappearance that is why he kept saying his a murderer because of guilt..... Even though tsukasa's disapperance was already years ago I think he don't want amane to forgot his sacrifice for him so he kept on showing and some what harassing amane not sexually
This is just my opinion I think tsukasa saying amane killed him because tsukasa sacrifice his life to save amane and amane blamed himself for tsukasa's disappearance that is why he kept saying his a murderer because of guilt..... Even though tsukasa's disapperance was already years ago I think he don't want amane to forgot his sacrifice for him so he kept on showing and some what harassing amane not sexually