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Uploaded August 20, 2009, with 1,724,000+ Niconico views
"ACUTE" is a song about a love triangle between KAITO, Miku & Luka. The two girls fell in love with KAITO, but they both made a promise to not confess to him. However, Luka and KAITO got closer and into a realationship, behind Miku's back. Miku later found out about it by coincidence, being afraid that she will be left behind, and feeling betrayed, she went to KAITO's home and confessed her feeling about the situation, telling him that she is afraid that she will be left alone and that she at least wants KAITO to hold her the way he holds Luka, KAITO felt sorry for her and did as she wished for that night.
After the events that occured last night, Miku felt that KAITO truly loves Miku, and that Luka had brainwashed him so that he will love her, and not Miku. Miku wanting to "fix" everything, and let to KAITO be free, she decided that she will pretend to be in an engagement with KAITO, without his knowledge.
The couple (Luka and KAITO) noticed that Miku's behaivor had change and that she acted weird, besides the fact that she remembered events that never happened, like KAITO getting her an engagement ring, one of the weird changes in her behaivor was that she didn't seem to care about cute things, like she used to, but instead liked and felt save when near knifes.
KAITO, felling guilty about the situation, called Luka to his house and told her that he embraced Miku, Luka acted shocked but understanded that KAITO wasn't the one to blame, but still felt guilty for making Miku like this. Right after that, Miku called Luka to find out where she was, Luka knowing Miku's situation was hesitant to anwser, but, Miku told her that she shouldn't act like that in front of KAITO because she could worry him, and then asked her why are they together without her, Luka started feeling even more guilty and started crying but KAITO hugged, causing her to drop her phone, and told her that it's him to blame for Miku's behaivor, not her.
The couple eventually decided that they should both help Miku turn back to who she once was. Miku feeling betrayed, grabbed a knife and when to KAITO's house, where Luka was, and tried to tell Luka that if she continues to mess with her fiancee everyone would hate her and that Miku, herself, would have to take some actions. KAITO tried to tell Miku that it's him to blame, that depite the fact that he knew he shouldn't have chosen either he needed Luka to be beside him and that all of Miku's hatred should be directed at him. Miku then went crazy and pulled out her knife so that she can punish Luka for making things like this, by stabing her, but instead, KAITO, who recalled his father who stabbed his family to death because his business failed, with KAITO being the only one to survive, took the blow, with his last words being "I love you.", which were, also, his fathers last words.
Miku upon realizing what she did stated that she is going take everything Luka loves and stabbed herself. Luka panicking and being afraid that she will lose both called an ambulance, saving them from death.
After Miku woke up in the hospital, both girls apologised, with KAITO, in wheeling chair, outside of the room, wishing for both of them to be happy together.