Compare Fiber Internet in Japan

Live offers

25 live offers compared from 12 providers, from ¥550 /month. Updated daily.

What is fibre internet in Japan?

Fibre internet (hikari kaisen, or optical line) is Japan's dominant home broadband, delivering fast, stable connections over fibre-optic lines to most homes and apartments. Japan built out fibre early and widely, so gigabit and multi-gigabit plans are mainstream. Much of the network runs on NTT's wholesale FLET'S HIKARI infrastructure, resold under many retail brands (hikari collaboration), alongside independent networks.

How the Japanese market works

NTT East and West provide the underlying FLET'S HIKARI fibre that retailers such as OCN, So-net, BIGLOBE and mobile carriers rebrand as their own hikari service. docomo (docomo Hikari), SoftBank (SoftBank Hikari) and au bundle fibre with mobile plans for combined discounts (set-wari). NURO, run on separate infrastructure, competes on headline speed, and J:COM offers cable and fibre broadband often paired with TV.

Benefits

High, stable speeds — gigabit-class fibre handles streaming, gaming, video calls and multiple devices without congestion.

Mobile bundle discounts — pairing fibre with a matching carrier's mobile plan (set-wari) cuts the combined monthly bill.

Wide availability — extensive fibre coverage means most urban and suburban addresses can get service quickly.

How to choose

First check which services reach your address and building type, since apartments and detached houses differ. Match the provider to your mobile carrier to capture bundle discounts, then compare the monthly fee, contract length and any cashback or installation campaigns. Consider the speed tier you actually need (standard gigabit suits most homes), whether a router is included, and cancellation or removal fees that can offset headline promotions.

Leading providers in Japan

docomo (docomo Hikari), SoftBank (SoftBank Hikari) and au dominate through mobile-bundle fibre on NTT's network. NURO leads on peak advertised speed via its own infrastructure, J:COM pairs broadband with TV, and OCN, So-net and BIGLOBE are established hikari-collaboration retailers reselling NTT East/West FLET'S HIKARI fibre.

What it costs

Monthly fees in the market span roughly ¥1,100 for promotional or apartment entry pricing up to around ¥8,360 for premium or high-speed detached-home plans, with most standard gigabit plans in the mid-range. Mobile-bundle discounts reduce the effective cost, and providers often add cashback or free-month campaigns. Watch for installation fees and multi-year contract terms with cancellation penalties.

Protections and regulation

Fixed broadband is regulated by the Ministry of Internal Affairs and Communications (MIC) under the Telecommunications Business Act, which mandates clear contract disclosure, an initial cancellation (cooling-off-style) period for many telecom contracts, and fair wholesale access to NTT's fibre so retailers can compete. Consumers are protected against unclear terms and aggressive sales under these rules.

Common questions

Which provider is fastest? NURO markets the highest peak speeds on its own network, but standard gigabit fibre from any major provider is ample for typical households.

Should I bundle with my mobile plan? If your carrier offers a matching hikari service, the set-wari discount usually makes bundling the cheapest overall option.

Fiber Internet in Japan — FAQ