Yes, if you register as a member with Travel CUBE, you can log in with an external account ID starting from the next instance of login.
Configuration can be undertaken via “Link to Non-AMC Account” found on “My Page” in the “Menu” that is available after logging in. Two kinds of IDs can be linked: Google and Yahoo! JAPAN IDs.
*Login via Facebook account is no longer available as of April 23, 2026.