In what year was the album “内緒 - EP” released by アイナ・ジ・エンド?

In what year was the album “内緒 - EP” released by アイナ・ジ・エンド?: The album “内緒 - EP” was released in 2021 by アイナ・ジ・エンド, featuring 4 tracks.
What is the most successful song from the album “内緒 - EP” by アイナ・ジ・エンド?: “あぁ揺れてる” is the biggest hit from the album “内緒 - EP” by アイナ・ジ・エンド.

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