I’m sorry I’ve been watching over you for 25 years

Sota Yukimura (Hokuto Matsumura) works in the secondary brand division of the cosmetics company "Nose Cosmetics." He has spent 25 years secretly acting from the shadows to protect the happiness of his boss, Mariko Nose (Sae Okazaki)—on whom he has a crush—but when his actions are exposed, Mariko tells him, "It's creepy!" Not wanting to scare her any further, Sota unfollows her on social media and begins to distance himself, avoiding even making eye contact with her at work. Meanwhile, despite what she said, Mariko finds she cannot get Sota out of her mind. Curious about his daily life, she takes her secretary, Izumi Takeda (Nozomi Sasaki), and her daughter, Sara (Seina Izutani), to tail Sota after work... Just as Sota is trying to cut ties with Mariko, his best friend, Tomoya Sagara (Akihisa Shiono), tells him, "I've got some huge scoop." Tomoya claims to have heard unsettling information that could threaten Mariko's happiness while attending the funeral of her stepmother, Sayuri (Miki Mizuno), who had been murdered. Normally, Sota would have sprung into action immediately to protect Mariko, but this time he refuses to get involved, saying, "That's not my job." He becomes self-deprecating, declaring, "I'm the kind of person who shouldn't even show his face in front of Mariko," and gives up on protecting her... Amidst this, the vengeful reach of Satoru Hatano (Yoji Tanaka)—a serial kidnapper who holds a grudge against Sota—is closing in fast! A terrible crisis is about to strike Sota and Mariko!!