Miho Nakayamabetinm, a reigning J-pop star of the 1980s who broke through to become a critically acclaimed dramatic actress and gained international attention for her starring role in the sentimental Japanese drama “Love Letter,” died on Friday at her home in Tokyo. She was 54.

Ms. Nakayama was found dead in a bathtub, according to a statement from her management company. The statement added, “We are still in the process of confirming the cause of death and other details.”

The Japan Times reported that Ms. Nakayama had canceled an appearance at a Christmas concert in Osaka, Japan, scheduled for that same day, citing health issues.

Ms. Nakayama — known by the affectionate nickname Miporin — rocketed to fame in 1985, becoming one of Japan’s most successful idols, as popular young entertainers there are known, with the release of her first single, “C.” That same year, she took home a Japan Record Award for best new artist.

She exploded on both the big and small screens that same year with starring roles in the comedy-drama series “Maido Osawagase Shimasu” (roughly, “Sorry to Bother You All the Time”) and the film “Bi Bappu Haisukuru” (“Be-Bop High School”), an action comedy set on a dystopian campus filled with uniformed schoolgirls and brawling schoolboys.

Such stories were popular teenage fare at the time, as evidenced by her subsequent role in “Sailor Fuku Hangyaku Doumei” (“The Sailor Suit Rebel Alliance”), a television series that made its debut in 1986, in which Ms. Nakayama played a member of a group of martial arts-savvy girls who squared off against wrongdoers at a violence-marred high school.

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