Shy office worker Sota steps in to help his colleague Mariko after her father, the head of their company, derails her plans for a new skin care division.

After transferring to Mariko's department, Sota uncovers evidence that an embittered executive has been plotting against her and stealing company funds.

Estranged from her father, Mariko dreads her upcoming birthday celebration at their family home; Sota devises a pretext to join the party.

Sota begins to suspect Ginjiro was involved in Mariko's attempted kidnapping 25 years ago and secretly searches the Nose Cosmetics office for clues.

Sota confronts Sayuri over her sinister plans for her stepdaughter; Mariko begins to feel like she and Sota may have met long ago.

Mariko discovers Sota has secretly been nearby all along. Suspecting Sota of murder, Taisuke finds a crucial clue to the killer’s identity.

Mariko is unnerved to learn Sota has secretly followed her on social media for years; Taisuke seems intent on casting suspicion upon Sota.

Driven by curiosity, Mariko secretly investigates Sota after work. Later, troubling news about her stepmother emerges, putting her well-being at risk.

Mariko learns Sota has secretly protected her since the incident 25 years ago, prompting her to make a drastic decision that changes everything.

After 25 long years of harboring secret affection for Mariko, the time has finally come for Sota to step up and save her from danger.