Kimiko wa Zanzou wo Aisu

Kimiko Otori, who has a calm personality, is in love with her classmate, Seka. He's a guy who's always in a rush, cool and impatient......! She wanted to give him a love letter to tell him how she felt, but she can't because he always goes by too quickly. Will the day ever come when the ultimate impatient boy and the ultimate calm girl come together?

(Source: ComicWalker, translated)