Koda Yumeko, an office worker, falls from the roof of the company in a serious accident. When she wakes up, she has no memories, but has transformed into a super positive person. She encounters a man in pain in the park.
Yumeko and the planning department are preparing for a presentation when she realizes her notebook is missing. She sees the mysterious man from the park, Yuki Keisuke, in the conference room.
Yumeko and Yuki have a daily routine of meeting in the park in the morning. A veteran designer clashes with outspoken Yumeko over a project. Yumeko learns about the relationship between Yuki, Maezono Hiroki, and Maezono Rikako.
Yumeko is put in charge of mentoring Shoinji, who comes to respect her as his 'master.' On the day of her date with Yuki, Yumeko is late because of work.
Yumeko sees Yuki and Rikako entering a hotel and becomes upset. During a meeting, everyone learns that Rikako has been taken to the hospital. Later, Yuki asks Yumeko out on a date. When they arrive, a woman accompanied by a nurse appears.
Yuki tells Yumeko the truth about his relationship with Maezono, and Yumeko's relationship with Rikako. Yumeko asks her colleagues about who she was before losing her memory. Yuki confesses his worries to Yumeko.
Yumeko has lost her new extremely positive personality, but her affection for Yuki and love for her job are the same. She moves forward step by step with the help of her coworkers. In the midst of it all, she heads off to search for Yuki.
