[1] His father is actor Junichi Ishida, and his mother is Mari Hoshikawa is an author and translator as well as the director of the Fuchuu City, Tokyo branch of Greens Japan, focusing on denuclearization activism.

His parents divorced when he was three, and he was raised by his mother, with his paternal grandfather Takeshi becoming a substitute for his father.

In the women's weekly magazine Josei Seven, the article "Junichi Ishida's secret child" was published as a tabloid rumor on the existence of Issei.

They debuted "Hot Road 1996" from Warner Music Japan in 1996, and performed live at Akasaka Blitz.

[6] His affiliated office also acknowledged that "dating is not a game", and announced that Ishida would be indefinitely suspended from acting.

In his blog just before the Tōhoku earthquake and tsunami, he discussed being beaten by a member of the Riot Police Unit at 11 years old for participating in a nuclear power phase-out movement with his mother, and revealed that he was called "Raji," which is his Catholic baptismal name.

[8] In 2012, he made various appearances on different television programs; such as Hitoshi Matsumoto no Suberanai Hanashi (23rd edition), Masahiro Nakai no Kinyōbi no Suma-tachi e, Jinsei ga Kawaru 1-funkan no Fukaī Hanashi, Down Town DX: 20-Shūnen Special, and Cream Quiz Miracle 9.

Initially, they planned to submit their marriage forms on the 9th, but Iimura postponed it because she developed acute back pain,[10] and their submission was made later, on the 18th.