Cancellation Notice

Japanese: 解約告知 - かいやくこくち

…However, even in the terminology of the Civil Code, there is confusion between the two. Therefore, in order to clearly distinguish it from cancellation, it is sometimes called a "notice of cancellation" or simply "notice." Unlike cancellation, it does not retroactively terminate the contract from the time of contract conclusion, but does not affect the contractual relationship up to the time of cancellation, but terminates the contractual relationship from the time of cancellation onwards. …

From the [Announcement]

…Because the terms cancellation and termination are sometimes used interchangeably, it is sometimes used to emphasize that the contract is terminated. It is also called a cancellation notice. In a completely different sense, there is a "notice of litigation" in civil court cases and a "duty of notification" in the Insurance Act. …

*Some of the terminology explanations that refer to "cancellation notice" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…もっとも，民法の用語上でも両者には混同がみられる。そこで解除との区別を明りょうにするために，〈解約告知〉あるいは単に〈告知〉ということもある。解除と異なり，契約を契約締結時にさかのぼって消滅させるのではなく，解約時までの契約関係には影響を及ぼさず，解約時以降の契約関係を消滅させるものである。…