The sixth episode of the drama series "Ichijigen no Sashiki" (One-Dimensional Cutting), starring Ryosuke Yamada of the popular group " Hey! Say! JUMP " and featuring actress Sei Shiraishi as the heroine, aired on August Getsuku on Yomiuri TV and Nippon TV (Sundays at 10:30 PM), and it has been revealed that the average viewership rating (according to Video Research, Kanto region) was 3.9% for households and 2.2% for individuals.
The drama is a human mystery based on the novel of the same name by Ryunosuke Matsushita, which won the 2025 Bunko Grand Prix in Takarajimasha's "This Mystery is Amazing!" competition. Yamada plays Nanase Yu, a graduate student studying genetics who gets caught up in an inexplicable mystery, while Shiraishi plays Iwamizaki Yui, the heroine who partners with Yu and is the niece of the professor at the research lab Yu belongs to.
Episode 6 was titled "The true identity of the stepsister is revealed, and the truth about what happened 27 years ago is revealed."
Yui (Shiraishi), who has been investigating the mystery of how the DNA of Ajisai (Mayu Hotta) matched that of human remains from 200 years ago, visits Kyoichi (Sasaki Kuranosuke), the president of Hie Pharmaceuticals. When she asks him why Iwamizaki (Masana Bokuzo) was killed, Kyoichi utters an unbelievable statement... Meanwhile, Yu is devising a seemingly reckless plan to ascertain the truth. And finally, the full scope of the research being conducted at Lake Loopkund is revealed... and so the story unfolds.
