Japanese drama “一次元の挿し木” episode 4 unveils shocking DNA twist

The Sunday drama “一次元の挿し木”, starring Ryosuke Yamada, aired its fourth episode on July 26 on Yomiuri TV/Nippon TV. The episode deepens the mystery when a 200‑year‑old human bone uncovered in the Himalayas is found to match the DNA of the protagonist’s missing sister, leading police to reveal that the sister may not exist at all. The plot also shows Yamada’s character, graduate‑student Yū Nanase, confronting threats and a series of revelations about the pharmaceutical company behind the case.

Social‑media response highlighted the dramatic climax and Yamada’s tear‑filled performance, with viewers debating whether the missing sister was a clone and praising the intense acting. A preview of the upcoming fifth episode, including a scene photo and synopsis, was also released.