A strict but loving grandma solves a myriad of issues for the people around her! Doumeki Miki lives in a small rural village surrounded by abundant nature and beautiful scenery. After becoming a widow at an early age, she’s spent many years working as a leader in her village. A beautiful, intelligent woman in her 70s, she’s incredibly spry, with perfect posture.
A popular English teacher, Mizuguchi Risako has been kidnapped three days before the high school's graduation ceremony. Four high school seniors received a mysterious challenge letter, asking them to solve the mystery of the kidnapping case within 72 hours. The four students are Kurokawa Yoshiki, his childhood friend Takahata Ayane, sports all-rounder Ogita Junpei, and school's beauty contest winner Komatsu Mio. The four students were wondering why they're the only ones who received the letter, but later gradually found out the "other face" of Mizuguchi which she has been hiding.
Shohei Kazama (Kinya Kitaoji), who travels all over the country and works as a special police chief, is new to the Iwaki Tokiwa Police Station in Fukushima Prefecture. Kenichi Nishino (Yuma Nakayama) and Kanji Takizaki (Hiroki Okada), the head of the criminal division, express their repulsion. Dai Kuramochi (Hiroshi Katsuno), an alumnus of the Fukushima Prefectural Police, tries to calm him down, but for some reason he continues to show hostility. At that time, Hisashi Ono's (Ichiro Ogura) body is found.
Imamiya (Fumino Kimura) is a detective who deals with fraud and scam cases. She arrests Kaji (Mahiro Takasugi), who is involved in a voice phishing case. Imamiya and her colleagues do not know who is at the top of the voice phishing group. Detective Tezuka (Kenichi Endo) suggests that they should let Kaji walk free and see if he will lead them to the top of the group.
Mitari Yo is a career woman who works for a shoe company. She finds her work rewarding and has successfully advanced in her career. Her love life, on the other hand, isn't doing as well. Ishida Ren works for a real estate developer and is Yo’s best friend. An ex-classmate from both high school and university days, he understands her best and is the only person she pours her heart out to. On Yo’s 29th birthday, the two friends place a wager to give 300,000 yen as a congratulatory gift to the one who is the first to get married by the last day they are 30. Although they declare that it is impossible for them to fall in love with each other, this wager, as well as advances by Ren’s junior in the company and Yo’s reunion with her ex-boyfriend, lead to gradual changes in the relationship of the two best friends.
Yumika is an actress. Since she was a child, she has had to endure her mother Yoshika (Shinobu Terajima) controlling her life. Yoshika is a “poison mother” to Yumika and Yumika cannot tolerate her mother anymore. Yumika appears on a talk show and criticizes her mother. Her criticism causes a sensation. Meanwhile, people around Yoshika state that she is not a poison mother and she is actually a good mother.
Rika Adachi (足立梨花) is a Japanese tarento and actress. She was born in Nagasaki Prefecture, and raised in Mie Prefecture. She has appeared in several films, including Say "I love you" and Ghost Theater, and has played leading roles in the TV Drama Kinkyori Renai: Season Zero and Yōkoso, Wagaya e.