International Sailor Moon Day

International Sailor Moon Day, celebrated annually on June 30, honors the magical girl heroine Usagi Tsukino—Sailor Moon—and her global community of fans since its founding in 2015.

History of International Sailor Moon Day

The day was started in 2015 by Lisa Terlato, inspired by Usagi Tsukino’s birthday on June 30. She launched the celebration as a way for fans to unite worldwide and share their love for the franchise. Since 2018, the official date has been firmly set as June 30, though some fan gatherings shift dates based on event schedules in different cities. ¹

While June 30 celebrates Sailor Moon’s birth, another tradition has grown honoring Mamoru Chiba (Tuxedo Mask) on August 6—originally linked to his birthday in some fandom circles—even though it’s less official. Still, the end-of-June celebration around Usagi remains the most widely observed and recognized.

Why is International Sailor Moon Day important?

It’s heartwarming how this day brings fans of all ages together under a shared love of courage, friendship, and transformation. On June 30, people don their tiaras or Sailor outfits and feel connected—wherever they are—to a childhood that meant something big. It’s a day when the simple magic of believing in yourself is celebrated in full color.

Beyond fandom fun, the day celebrates the show’s forward-thinking messages—female empowerment, acceptance, and LGBTQ representation long before these were mainstream. Every casual conversation or cosplay meetup around Sailor Moon Day underscores how its themes still resonate with new generations and help shape inclusive, supportive spaces.

• Fans host or join meetups, cosplay, and watch parties under the banner of shared joy
• It’s a chance for newcomers to discover a universe that’s inspired millions
• Collective fan art, videos, and posts highlight creativity born from passion
• Simple gatherings spark local friendships and build global ties
• It reinforces that fandom can be a space for kindness, courage, and self‑expression

Fan facts about Sailor Moon

• Sailor Moon was originally a manga created by Naoko Takeuchi and debuted in 1991 in the magazine Nakayoshi.
• The anime adaptation first aired in 1992 and became a global hit, credited with popularizing anime outside Japan.
• The original manga series was titled “Pretty Guardian Sailor Moon”, not just “Sailor Moon”.
• The full name of Sailor Moon is Usagi Tsukino, which means “rabbit of the moon” in Japanese—a reference to Japanese folklore.
• The Sailor Moon series helped establish the magical girl (mahou shoujo) genre as a blend of action, friendship, and transformation.
• Sailor Moon was one of the first major anime to feature LGBTQ+ characters openly, such as Sailor Uranus and Sailor Neptune.
• The English-dubbed version in the 1990s was heavily edited, changing names and relationships to make it “more acceptable” for Western audiences.
• The transformation sequences were partly inspired by tokusatsu shows like Kamen Rider and Super Sentai.
• The characters’ outfits were influenced by Japanese school uniforms, especially the sailor-style fuku, blending traditional schoolwear with superhero fashion.
• Naoko Takeuchi was a trained chemist, and many planetary or mineral references in the series reflect her scientific background.
• The anime has been rebooted as Sailor Moon Crystal, a more faithful adaptation of the manga launched in 2014.
• Sailor Moon has inspired musicals, video games, stage shows, and even theme park attractions in Japan.

How to Celebrate International Sailor Moon Day

You don’t need a big stage to join in the fun—this day thrives on small, heartfelt celebrations. Watch your favorite episode or reread a cherished manga volume, and invite a friend to share the experience. It’s wonderful what bonding happens when you both say, “Moon Prism Power, Make Up!” together.

If you’re feeling playful, organize a mini cosplay session—tiara, wand, sailor uniform, whatever you’ve got—and maybe snap photos or make a small tribute video to share online. Or, host a casual group chat to talk about why the show still matters. It can be low-key, but it always feels special when shared.

• Stream or rewatch classic or new Sailor Moon episodes
• Dress up as your favorite Guardian, even with a simple twist
• Share fan art or personal reflections with #InternationalSailorMoonDay
• Host a watch party—online or in your living room
• Connect with local fans via social or nearby events

International Sailor Moon Day Dates Table

1. https://sailormooncelebration.com/ismd[↩]