150GB Plan is back now with 4980 yen / month.
2month advance payment of 8,980 yen and 3month advance payment of 12,980 yen are still available.
New pricing of 100GB Plan will start with 4480 yen/month.
2month advance payment of 8,880 yen and 3month advance payment of 12,880 yen are also new.
For referral order, 100GB & 150GB plan both gives monthly referral discount amount of 500 yen.
These 2 plan sims can be used with Grace Prepaid WiFi as Spring Sale Price of 6,980 yen and that of 5,980 yen for SIM only order as of now.
Spring Promo continues until end of April 2021.
For more details, you can check the link here about Spring Sale on Grace WiFi with New Plans.
For existing users of 100GB plan, new monthly rate will start after the billing date of April 13th. You can check the plan status with smartpit number.