Warning: This song contains questionable lyrics and themes; it may be inappropriate for younger audiences.
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Uploaded August 20, 2009, with 1,668,000+ Niconico views
"ACUTE" is a song about a love triangle between KAITO, Miku & Luka. Although KAITO seems to be engaged with Miku, he maintains a parallel relationship with Luka. To make it worse, the three were good friends in the past. Miku suspects that KAITO is unfaithful, but she doesn't dare ask as their relationship deteriorates. Meanwhile Luka, aware of the betrayal, takes the role of the typical awaiting mistress. One night, Miku calls to Luka in the middle of a encounter with KAITO; although she tries to conceal it, Miku hears what's going on.
Later, a regretful Luka laments about the old days, when they were good friends. Miku, feeling betrayed because of the broken promise, heads to Luka's place holding a knife in her hands. There, she caught them in flagranti. She threw herself into KAITO's arms crying, then the PV shows her looking briefly at Luka, smiling, before she stabs herself in the neck. The song end with Miku's final words, which imply that she stabbed KAITO as well in an attempt to take him with her (this is confirmed in the song's sequel, "ReACT").