Anime fans love discovering hidden treasures. Whether it’s a forgotten OVA from the ‘90s or a one-season wonder that never got an English dub, searching for underrated shows is part of the fun.
But in the excitement of finding lesser-known gems, it’s easy to forget about the anime that were — and still are — massive hits in Japan. Long before global streaming, Japan had its own blockbuster shows that ruled the ratings, sold tons of merchandise, and became cultural icons. Yet, many of these never reached Western audiences.
The phrase “never heard of” might sound exaggerated, but it’s true. These aren’t tiny art projects or short-lived releases. They’re long-running, hugely popular anime that most Americans — even hardcore fans — wouldn’t recognize. Some were made for kids, others for families, and a few were so deeply tied to Japanese culture that they didn’t translate well abroad.
Here are 10 super-popular anime that most Americans have never heard of:
1. ‘Chibi Maruko-chan’ (1990 – Present)
Set in 1970s Japan, Chibi Maruko-chan follows Momoko Sakura, a cheeky and lovable third-grader known as “Maruko.” Living with her extended family, she faces everyday school life, friendships, and small adventures with humor and heart. The comedy focuses on family moments and relatable childhood experiences.
Based on Momoko Sakura’s semi-autobiographical manga, the anime first aired in 1990 and still runs every Sunday. It’s become a Japanese cultural classic thanks to its nostalgic tone and honest look at growing up.
2. ‘GeGeGe no Kitarō’ (1968 – Present)
Kitarō, a boy from the Ghost Tribe, protects humans from evil spirits called yōkai, alongside his eyeball father Medama-Oyaji and other odd allies. Mixing supernatural horror with moral lessons, the series tackles themes like greed, ignorance, and fear.
Since 1968, it’s been rebooted seven times, each version modernizing the story but keeping the folklore roots intact. Created by Shigeru Mizuki, GeGeGe no Kitarō is often credited with popularizing yōkai culture in Japan, expanding into manga, live-action films, and museums.
3. ‘Touch’ (1985 – 1987)
Twin brothers Tatsuya and Kazuya live next door to their childhood friend Minami, who both brothers secretly love. Kazuya is the perfect student and athlete, while Tatsuya hides his real potential. After tragedy strikes, Tatsuya must carry on his brother’s dream and face love, loss, and responsibility.
Touch was a ratings hit in the ‘80s, with over 30% viewership during big episodes. What starts as a lighthearted romance turns into an emotional sports drama that’s both touching and powerful. Its grounded animation and storytelling made it unforgettable.
4. ‘Pretty Cure’ (2004 – Present)
The Pretty Cure franchise began with Futari wa Pretty Cure, where two middle school girls, Nagisa and Honoka, become magical warriors protecting Earth from darkness. The series mixes transformation magic, action, and friendship.
Each new season introduces different characters and villains, creating a shared universe of heroines. Since 2004, it has aired over 900 episodes and more than 30 movies. A Sunday morning favorite in Japan, it’s often shown alongside Kamen Rider and Super Sentai. The U.S. adaptation Glitter Force only scratched the surface of the original.
5. ‘Mazinger Z’ (1972 – 1974)
Koji Kabuto inherits the giant robot Mazinger Z from his scientist grandfather to fight the evil Dr. Hell and his army of mechanical monsters. Koji pilots the robot from its head, battling creative and terrifying enemies each week.
When Mazinger Z aired from 1972 to 1974, it completely changed anime history by introducing the “pilot-controlled mecha” idea — influencing series like Gundam and Evangelion. Despite its huge impact, it never became well-known in the U.S.
6. ‘Sazae-san’ (1969 – Present)
Sazae-san tells the story of Sazae Fuguta, a cheerful housewife living in Tokyo with her large family. Each episode has three short, funny, everyday stories about shopping, family arguments, and neighbors.
With over 8,000 short episodes since 1969, it holds the record for the longest-running animated series in the world. Airing every Sunday on Fuji TV, its theme song even marks the end of the weekend for many families. Despite being simple, it’s full of warmth, humor, and social commentary.
7. ‘Slayers’ (1995)
Teen sorceress Lina Inverse loves treasure and chaos. With swordsman Gourry Gabriev, she travels through a world of magic, bandits, and ancient evils. What starts as a comedy quickly turns into epic fantasy battles and emotional storytelling.
Slayers perfectly balances humor and depth. Lina, voiced by Megumi Hayashibara, became a beloved icon. While it was huge in Japan, inconsistent Western releases kept it from reaching mainstream success in the U.S.
8. ‘Ojarumaru’ (1998 – Present)
Five-year-old prince Ojarumaru steals a magic scepter from the King of Hell and accidentally travels from ancient Japan to modern times. Living with a boy named Kazuma, he learns about today’s world while being chased by three goofy demons.
Each ten-minute episode tells a lighthearted story filled with humor and imagination. Airing daily since 1998 on NHK, it’s one of Japan’s longest-running anime, with over 2,000 episodes.
9. ‘Glass Mask’ (1984)
Maya Kitajima, a shy teen from a poor background, has an incredible acting talent. Discovered by retired actress Chigusa Tsukikage, Maya trains under her to play the legendary role of “The Crimson Goddess.” She faces rivalries, sacrifices, and intense competition in her rise to fame.
The 1984 anime adaptation ran for 22 episodes and captured the emotional intensity of the manga, which sold over 50 million copies. With its classic ‘80s art style and dramatic storytelling, Glass Mask became a cornerstone of shōjo anime.
10. ‘The Prince of Tennis’ (2001 – 2005)
Ryoma Echizen, a 12-year-old tennis genius, returns to Japan and joins Seishun Academy’s elite tennis team. With his confidence and unique techniques, he challenges older players and earns respect through epic matches.
Airing from 2001 to 2005, the show ran for 178 episodes, multiple OVAs, and a movie. It was a cultural phenomenon, inspiring a tennis boom in Japan. With over-the-top moves and stylish animation, it remains one of the most beloved sports anime — even if many Western fans missed it.