Nodame Cantabile (2006)

S1E4 Will They or Won't They? Battle of the Regular Concert!

Chiaki proves utterly impossible to satisfy. In a last-ditch effort to rewire him before the regular concert, Nodame’s bizarre army of earthbound aliens storms his apartment, arriving inside a mysterious, unmarked heating device. Their mission: reprogram Chiaki at any cost—whether he likes it or not.