2014 | 12 Episodes

Season 0 of 12-sai.: Chicchana Mune no Tokimeki premiered on April 3, 2014.

2016 | 12 Episodes

Season 1 of 12-sai.: Chicchana Mune no Tokimeki premiered on April 4, 2016.

2016 | 12 Episodes

Season 2 of 12-sai.: Chicchana Mune no Tokimeki premiered on October 3, 2016.