Tokenai Koi to Chocolate(2016)

Tokenai Koi to Chocolate

Tamako, a junior high student, decides to confess to Kou, her childhood friend who will be attending a high school outside the prefecture starting in the spring. On the day before her confession, she meets a beautiful girl at the Mirror Lake which is rumored to grant wishes. Then, on Valentine's Day, an unexpected development was waiting...
Near, far, passing by each other... a non-stop love story of two childhood friends.

(Source: Kodansha, translated)