• Airalo Japan, SoftBank +1: 7 days / 5GB $10, 10GB $17. Their “unlimited” 7-day SKU is $27. Fair use: 3GB high-speed per 24h, then 1 Mbps. Hotspot allowed.
• Holafly Japan, KDDI/SoftBank: 7 days $27.50. Official page: hotspot 1GB/day. They do not publish a Japan GB/day FUP number.
• Ubigi, KDDI + Docomo: 10GB / 7 days $14. Hiding Ubigi because I cannot track it would be a lie.

If you mostly walk Tokyo with Google Maps, 5GB for 7 days is usually enough. Hotspot a laptop all day and it is not.

I publish the dated copy here (Airalo checkout is an affiliate link; Holafly and Ubigi are official): https://before-you-land.tiiny.site/japan/7-days/

Sources are the three stores, not a travel blog SKU.