Momose Hikaru is in major debt after falling victim to an international romance scam. She interviews to become a caretaker of a luxury penthouse. Her first test is to make a dinner that will satisfy the four celebrities living there.
Hikaru prepares to leave after Shion berates her, but the other three residents convince him to hire her. Shion reluctantly agrees, but says that romance is banned. Ritsu warns Hikaru, and Luka tells Hikaru about her connection to Shion.
Hikaru throws away a candy wrapper with sheet music written on it while cleaning. Ritsu acts suspiciously, Luka is worried but secretly jealous of Hikaru, and Shion catches Ritsu forcibly pulling Hikaru towards the bed.
Ritsu forces Hikaru into a kiss and Hikaru puts her foot down. His attitude changes drastically as he reveals the reality. Hikaru becomes dizzy that night after taking a bath. Akito later divulges who helped her after she collapsed.
Akito wants Hikaru to pretend to be his girlfriend at a work party, and Shion has mixed feelings about it. Once there, Hikaru meets Akito's first love and makes a huge mistake.
Shion and Luka get attacked on their way to work. Luka gets patched up after suffering a minor injury, but Shion reveals to Ritsu that he blames himself. Akito makes an unexpected confession to Hikaru.
Hikaru worries about how to respond to Akito, and a rift has developed between Shion and Luka. Shion confronts his feelings. A model starts an incident at a party held for Ritsu at the penthouse, and Hikaru ends up in tears.
Ritsu and Luka worry about Hikaru, but Akito is angry at Shion. Hikaru feels a sense of fulfillment at her new temp position, but also feels lonely. Akito receives a work call and makes a decision.
Shion had been encouraging Akito to marry Hikaru, but now regrets his actions. Ritsu tells Hikaru that he will be leaving for the US after his concert. Luka returns to modeling and, remembering Hikaru's words, regains her confidence.
Ritsu goes to the US with a secret crush in his heart, and Luka decides to move out to become independent. Akito asks Hikaru to make a choice, but Shion asks her out on a date for the first time.
