Akutsu-san wa Oshi ni Niteiru

Akihara-san, who has just entered high school, is a self-professed introvert whose only solace is reading her favorite manga. But then, a classmate who looks just like her favorite character (her "oshi") appears right before her eyes! Akutsu-san's height, personality, words, and actions are just like her oshi! Is this a dream come true!?

(Source: Kodansha, translated)