Ice Cream Kanojo

Apart from being rather short, Kanta is exceedingly normal. In addition, he has a girlfriend. She always has a poker face, is untalkative, and, at first glance, seems cold. Nonetheless, she is very sweet to Kanta. In comparison to her appearance, Kanta sees the sweetness in his girlfriend, and becomes overwhelmed by her!

(Source: Kodansha, translated)