Rika Adachi is a Japanese tarento and actress. She was born in Nagasaki Prefecture, and raised in Mie Prefecture. She has appeared in several films, including Say "I love you" (2014) and Ghost Theater (2015), and has played leading roles in the TV Drama Kinkyori Renai: Season Zero (2014) and Yōkoso, Wagaya e (2015).

Say I Love You is a Japanese manga series written and illustrated by Kanae Hazuki. It was serialized in Kodansha's shōjo manga magazine Dessert from February 2008 to July 2017, with its chapters collected in 18 tankōbon volumes. An anime adaptation by Zexcs aired from October to December 2012. A live action film adaptation premiered in July 2014.