“What kind of movie is ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’?” Are you wondering whether there’s a way to watch it for free and which streaming services will carry it? In this article, we take a deep dive into how to watch the film ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’ for free. We’ll also explain which subscription platforms are likely to stream it and how it relates to the original work and the drama adaptation. Read this and you won’t miss the latest film!

What Is ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’?
‘Ossan no Pantsu ga Nandatte Ii Janai ka!’ is a Japanese film released in 2025 that drew attention for its unique title. Based on a popular web manga of the same name, it has already been adapted into a TV drama, and the film can be seen as a culmination of the series. Blending comedy with moving human drama, it has earned high praise from many viewers as “tear-jerking” and “profound.”
Overview and Production Background
This work portrays human relationships through the lens of underwear. Though the theme may look silly at first glance, it carries a powerful message about “living true to yourself without worrying about others’ opinions.” The lead role is played by Taizo Harada, with Hinako Sakurai as the heroine, and the film boasts a star-studded cast. Directed by up-and-coming filmmaker Yugo Ishikawa, the movie reimagines the original’s world with a distinctive sensibility.
‘Ossan no Pantsu ga Nandatte Ii Janai ka!’ Synopsis & Film Info
The story centers on Yoshio Tanaka, an office worker approaching retirement. One day, he goes out wearing his “favorite flashy underwear,” and a photo of him spreads on social media. He suddenly becomes a hot topic online. At first, Tanaka is embarrassed, but he gradually realizes the importance of living true to himself. Encounters with quirky characters change his life in this heartwarming tale.
Characters and Cast
Here are the main characters and cast members.
Character | Cast | Traits |
---|---|---|
Yoshio Tanaka | Taizo Harada | Protagonist. A middle-aged man who wears flashy underwear |
Yukari Morimoto | Hinako Sakurai | A young woman who supports Tanaka’s transformation |
Makoto Saeki | Tsuyoshi Muro | Tanaka’s coworker. Teases him but has his back |
Manager Matsuda | Ikkei Watanabe | Owner of the underwear shop |
Subscription Services Likely to Stream ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’
The film is slated for release in July 2025. Therefore, it isn’t streaming yet, but based on the drama’s past availability and partnerships, we can predict where it may stream. Below is a table summarizing likely platforms and their features.
Service | Predicted Start Window | Price (tax incl.) | How to Watch for Free |
---|---|---|---|
U-NEXT | September 2025 | ¥2,189/month | Watch via 31-day free trial |
FOD Premium | October 2025 | ¥976/month | Watch via initial 2-week free trial |
Netflix | January 2026 | From ¥790/month | No free trial (subject to change) |
Amazon Prime Video | December 2025 | ¥600/month | Watch via 30-day free trial |
U-NEXT
U-NEXT also carries the drama adaptation of ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’, making it a top candidate to stream the film first. With the 31-day free trial, you can enjoy many other movies and shows as well.
FOD Premium
As Fuji TV’s platform, FOD has previously offered the drama version exclusively, so it’s highly likely they will also stream the film. New users get a two-week free trial, offering great value.
Predictions for Netflix and Others
Netflix and Amazon Prime Video have extensive track records with popular Japanese films, so there’s plenty of potential for availability. However, free trials and pricing can change frequently, so be sure to check the latest details.
FAQ: Watching ‘Ossan no Pantsu ga Nandatte Ii Janai ka!’
Here we answer common questions about the film, including differences from the original and ties to the drama—useful info to know before watching.
How does it differ from the original?
The original is a series of short, essay-style comic episodes, while the film restructures the story around the life of a single middle-aged man. While the settings and episodes are faithful to the source, the film adds original characters and direction, making it more dramatic. This lets fans of the original enjoy it with a fresh perspective.
How is it related to the drama version?
While it shares the same world and basic character setups as the 2023 drama, the film tells a completely new story. It’s designed to be enjoyed even if you haven’t seen the drama, so no prior knowledge is required. Meanwhile, viewers of the drama can have fun spotting returning characters and their growth.

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