The way you can change your subscription plan is different depending on your current plan.
Please refer to the following details for respective cases.
Rolling Susbscription → Fixed Subscription
Please cancel your rolling subscription from the Account Settings page ( https://iknow.jp/account/edit ) by clicking "Cancel subscription" in the iKnow! Pro Member area. OR if you purchased it via android app, please cancel it on GooglePlay.
*Your account will be valid unti the end of the month even if you cancel your subscription mid-month.
*Your study data will not be lost.
Your subscription will expire on the first day of the next month.
Please sign up for a fixed subscription from the iKnow! Pro Membership page then.
Fixed Subscription → Rolling Subscription
After your fixed subscription expires, sign up for a rolling subscription from the iKnow! Pro Membership page.