Ringu

• Made on an estimated budget of around $1.2 million, Ringu earned roughly ¥1.7 billion (about $13 million) at the Japanese box office alone and became the highest-grossing horror film in Japanese box-office history — a record it still holds today.
• Sadako was played by Rie Ino'o, a Kabuki theater actress cast for her ability to move in unnaturally fluid, unsettling ways. For her iconic crawl, Ino'o walked backward in a jerky, contorted manner drawing on her Kabuki training, and the footage was then reversed to create the effect — no digital trickery involved.
• The well was a purpose-built set rather than a real location, giving the crew control over lighting, water and the rigging needed for the drowning effects. In the story it's Hiroyuki Sanada's character Ryuji — not Nanako Matsushima's Reiko — who actually climbs down into the well to dig; Reiko stays above hauling up buckets of water until she's the one who finds Sadako's remains.
• The film was based on Koji Suzuki's 1991 novel 'Ring,' but Nakata significantly altered the protagonist from a man (Kazuyuki Asakawa) to a woman (Reiko), and stripped out much of the novel's scientific/virus-based rationalization for the curse, making Sadako's vengeance more ambiguously supernatural on screen.
• Ringu's success directly spawned the J-horror boom and influenced later films including 'Ju-On: The Grudge' and 'Pulse' (Kairo), as well as the American remake 'The Ring' (2002) — Hideo Nakata himself later crossed over to direct its 2005 sequel, 'The Ring Two.'
• Despite the buzz from the 2002 American remake, Ringu itself never got a US theatrical release. DreamWorks put it out direct-to-video in the US and Canada on March 4, 2003, under the transliterated title 'Ringu.'

Ringu functions as a horror of media reproduction — Sadako's curse spreads through the analog copying of a videotape, weaponizing the very act of duplication that defines mass media. The tape is a chain letter that kills, and the only escape is to copy it and pass it on, making survival indistinguishable from complicity in the curse's spread.

Sadako's emergence from the well and through the television screen represents the return of repressed feminine rage — she is a woman killed by a male authority figure (her father, ESP researcher Dr. Ikuma) and sealed in a well, and her vengeance comes through the domestic appliance that defined Japanese family life in the 1990s. The TV is her portal because it's where the nuclear family she was denied gathers.

Ryuji's death at the film's climax, despite his intellectual analysis of the curse, suggests the film punishes rationalism — his academic distance from the horror is precisely what makes him vulnerable, since he never thinks to copy the tape himself. Reiko survives because she unknowingly already broke the curse's rule by dubbing and sharing her copy, and she ultimately saves her son the same way, by passing the tape along.

A cursed VHS tape kills anyone who watches it seven days later — a urban legend that becomes terrifyingly real when four teenagers die simultaneously, their faces frozen in silent horror. Reporter Reiko Asakawa investigates, watches the tape herself, and receives the obligatory death call. She enlists her estranged academic ex-husband Ryuji to crack the mystery before the week expires. Their trail leads to Izu Oshima island and a woman named Sadako, sealed alive in a well decades ago. The tape is her rage, her psychic fury broadcast through static. Reiko's young son watches it too. The clock is already running.