He is just a friend.

High school girl Shirokawa Komomo has an ambition: to make "male friends"! But then she notices that her classmate Oba-kun, who always smiles when talking with other boys, is completely expressionless when talking with girls... Is making male friends actually much harder than finding a boyfriend? A youthful friendship comedy brought to you by a new generation! (Source: Kodansha, translated)