In what year was the album “Doki Doki” released by 7!!?

In what year was the album “Doki Doki” released by 7!!?: The album “Doki Doki” was released in 2013 by 7!!, featuring 11 tracks.
What is the most successful song from the album “Doki Doki” by 7!!?: “Lovers” is the biggest hit from the album “Doki Doki” by 7!!.

Other artists of J-Pop/J-Rock