Hummingbird Effect

Briefly about Hummingbird Effect manga:

HUMMINGBIRD EFFECT is a lighthearted story of two girls who chose to love in this world regardless of being forced to follow heart rate limit rules. Aya isn't interested in the boyfriend her grandfather chose, but instead falls for handsome upperclassman Asami, who's younger brother is the same age as she. Due to this love, she must fight against the family head, even though protecting her secret will cause hardship between her and Asami. Rika has been in love with Aya ever since they met in kindergarten; so when they're assigned as roommates, Rika can't help