“NINJA WiFi” is the most popular pocket-sized rental WiFi in Japan 【No. 1 in the industry for number of pickup locations!】
2025.12.04投稿
Links on this site contain affiliate advertising.
NINJA WiFi is known for its easy pickup at major airports and reliable support. NINJA WiFi is easy to set up and has a call center that is available daily.From what I’ve researched, there are many free WiFi spots in Japan, but in some cases only smartphones with contracts in Japan can connect.
In Japan, carrying pocket-sized rental WiFi makes traveling more comfortable and shopping more enjoyable. If you apply through my blog site, you will receive a 20% discount off the regular price, so I recommend it to anyone who wants to enjoy their trip in Japan comfortably.
Used by over 23 million people worldwide!
Three reasons why NINJA WiFi is being rented in Japan!
Easy to pick up and return
We have the most locations in Japan where you can pick up and return your WiFi router. You can pick it up at the airport or at the pick-up counter free of charge, so it’s a great deal.
It doesn’t matter if the pick-up location and return location are separate. You can also pick it up at your hotel, so you can connect to WiFi before heading out.
Easy operation and reliable support system that allows you to use it just by turning on the power
The WiFi router is ready to use immediately after powering it on. It features a touch panel, making operation intuitive and easy. The NINJA WiFi call center is open every day from 10:00 to 19:00 (JST), so if you have any questions, they will be happy to assist you.
About NINJA WiFi rental routers
NINJA WiFi offers two types of WiFi routers for rent: “SoftBank 4G” and “docomo 5G”. We will explain the features of each.
More information about SoftBank 4G
| Communication systems | 4G(4th Generation) |
| Model name | K4 |
| Telecommunications carrier | SoftBank |
| Communication Method | SoftBank 4G LTE/SoftBank 4G |
| Communication speed (theoretical value) | Downstream (receiving): up to 1Gbps Upstream (sending): up to 100Mbps |
| Price | 1GB/Day Plan:440 yen/Day 3GB/Day Plan:770 yen/Day 5GB/Day Plan:1,100 yen/Day 10GB/Day Plan:1,320 yen/Day Unlimited Plan:1,980 yen/Day |
| Size | about 126(W)×68(H)×12.1(D)mm |
| Communication restrictions | Yes (1GB-10GB/day plans only) If the daily data limit is exceeded, data speed will be limited to 128kbps. |
Check here for SoftBank network coverage areas!
Is your destination within the SoftBank 4G LTE/SoftBank 4G area?
To ensure you enjoy your important trip, don’t just decide based on price, be sure to check carefully before you travel.
docomo 5Gの詳細
| Communication systems | 5G(5th Generation) |
| Model name | U50 |
| Telecommunications carrier | docomo 5G |
| Communication Method | SoftBank 4G LTE/SoftBank 4G |
| Communication speed (theoretical value) | Downstream (receiving): up to 20Gbps Upstream (sending): up to 10Gbps |
| Price | Completely unlimited plan: 2,200 yen/day |
| Size | about 68(W)×151.5(H)×14.3(D)mm |
| Communication restrictions | Only applicable in cases of excessive use or illegality |
Check out docomo’s coverage area here!
docomo’s coverage area is wider than SoftBank’s, and they offer faster connection speeds.
docomo offers easy connection even in mountainous and rural areas!
You can only apply for NINJA WiFi on the official website!
I researched websites where you can sign up for NINJA WiFi, but I found out that it’s only available on the official website!
I recommend signing up through my blog site because you can get 20% off the regular price!
Used by over 23 million people worldwide!
Explaining how to rent docomo 5G
NINJA WiFi can be delivered to your hotel or accommodation.We arrange for it to arrive the day before your arrival in Japan, so you can enjoy your trip with peace of mind.You can also collect your WiFi router at the airport or via Smart Pickup.
The actual steps from applying for a WiFi router to connecting to it are as follows.
Since I live far from the airport, I received it by courier this time.
- Submit the application form on the official website
- Payment by credit card
- Pick up at the airport, pick-up counter, or delivery service
- Enjoy unlimited WiFi while traveling
- Once you’re done using it, return it at the airport, at the pickup counter, or by courier.
1.Submit the application form on the official website
Submit the application form from the official website. Select the WiFi router model, pick-up location, return method, etc.
Please check the price confirmation screen to see if the 20% discount has been applied!
2.Payment by credit card
Payment will be made by credit card. Be careful not to make any input errors.
3.Pick up at the airport, pick-up counter, or delivery service
Please pick up your order at the designated location on the designated date. If you have selected courier delivery, it will be delivered as shown in the image below.
4.Enjoy unlimited WiFi while traveling
The access point and password are displayed at the bottom of the touch panel. Simply select the access point on your smartphone, tablet, or PC and enter the password to connect.
*In the image below, the password has been hidden by a cat sticker.
There are labels “GLOBAL WiFi” and “WiFi Rental.com”, but don’t worry, this is because the same devices are also provided to Japanese customers.
5.Once you’re done using it, return it at the airport, at the pickup counter, or by courier.
If you are returning the item via courier service, a special return bag will be included. Close the lid tightly, attach the return slip, and return it via the designated courier service. If you are returning the item to the airport counter, be sure to bring it to the counter before boarding your flight.
Used by over 23 million people worldwide!
NINJA WiFi FAQ
Here are some frequently asked questions about NINJA WiFi. Please check them out before purchasing.
Is there a limit to the amount of data that can be used per day on an unlimited device?
Yes. There is a daily data limit. Data limits vary by manufacturer.SoftBank 4G does not have a specific limit, but docomo 5G may limit your speed only if excessive data usage of 10GB or more per day or 300GB or more per month is detected.
Watching 4K videos or playing high-definition games uses a lot of data, so be careful if you plan to transfer a lot of data at once.
How many devices can I share?
You can connect up to five devices to one WiFi router. However, connecting five devices at the same time may cause unstable communication, so we recommend using two or three devices. If you plan to connect four or more devices, you should rent a second WiFi router.
What are the procedures and fees if I want to extend my stay?
You can extend the rental period by contacting the customer center. Please note that if you extend the rental period without contacting the customer center, you will be charged an extension fee of 1,617 yen per day x the number of days exceeded.
*If the fee for a completely unlimited plan, etc. exceeds 1,617 yen/day, regardless of whether you contact us to extend the plan, we will pay the communication fee you have subscribed to multiplied by the number of days exceeded and the amount of any options (such as the peace of mind insurance pack) multiplied by the number of days exceeded.
What if I go home and forget to return it?
If you are returning the product from overseas, please fill out the return shipping slip as follows. If you have any concerns, please call the call center (+81-50-8882-5774).
| Receiver | Vision inc |
| Company | Vision inc |
| Address | C・D area 1027-7 WASHINOYA, NO 2 Kashiwa Distribution Center, Kashiwa-city, Chiba, JAPAN |
| ZipCode | 270-1443 |
| Phone | 81-50-5893-8021 |
Note: Please add the “No Commercial Value” item in the remarks section.
What if I want to cancel my reservation?
You can cancel free of charge up to 4 days before the departure date on My Page. Payments made 3 days or more before the pick-up date are as follows:
Customers without cancellation insurance: 100% of the rental amount
Customers with cancellation insurance: Cancellation insurance fee only
Please note that refunds are not available if you shorten the rental period after departure.
If you cancel, the refund will be made through your credit card company. The refund will be made the following month or the month after. For details on the date and time, please contact your credit card company.
What languages does the call center support?
NINJA WiFi’s call center, +81-50-8882-5774, only supports English. If you would like to inquire in Chinese, please use email (info@ninjawifi.com). Email inquiries made after 7 PM will be replied to the next day. We usually reply within the same day, so please feel free to contact us.
Used by over 23 million people worldwide!
Useful WiFi Tips to Know
In Japan, you can use packet communications by renting a WiFi network, or by signing up for a SIM card or eSIM.We’ll explain in detail how to use WiFi and SIM/eSIM.
How to distinguish between WiFi and SIM/eSIM
In Japan, you can use packet communications by renting a WiFi network, or by signing up for a SIM card or eSIM. We’ll explain in detail how to use WiFi and SIM/eSIM.
| Number of connectable devices | setting | Required equipment | |
|---|---|---|---|
| NINJA WiFi | 5 units | easy | WiFi router |
| SHOGUN SIM | Only 1 unit | hard | SIM-free smartphone |
| NINJA eSIM | Only 1 unit | easy | eSIM-compatible smartphones |
Explaining free WiFi spots in Japan
There are free WiFi spots in Japan, such as at airports, train stations, and convenience stores. The following mark is displayed in places where it is available.
» Search for WiFi spots on the Japan.Free WiFi website
Introducing the dangers of free WiFi in Japan
When using free WiFi in Japan, be aware of the following risks.
Most free WiFi spots have unencrypted, open connections, so your communications may be eavesdropped on.
Malicious third parties may set up access points disguised as “Free WiFi,” which can be difficult even for Japanese people to spot. Spoofed access points can lead to the theft of your personal information.
If you enter your bank or credit card information, it may be intercepted.
Rest assured with year-round support! NINJA WiFi is the best choice for sightseeing in Japan
There are still very few free WiFi spots in Japan, so we recommend renting a pocket WiFi device and carrying it around with you. With a completely unlimited plan, you can search for delicious restaurants and beautiful tourist spots without worrying about data usage. Softbank’s reasonable prices are attractive, but docomo offers the best connection in Japan.
It’s helpful to have daily support even in the unlikely event of an emergency. When you’re traveling in Japan, try renting NINJA WiFi and taking advantage of the 20% discount.
Used by over 23 million people worldwide!