In what year was the album “Koigokoro” released by Da-iCE?

In what year was the album “Koigokoro” released by Da-iCE?: The album “Koigokoro” was released in 2016 by Da-iCE, featuring 3 tracks.
What is the most successful song from the album “Koigokoro” by Da-iCE?: “恋ごころ” is the biggest hit from the album “Koigokoro” by Da-iCE.

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