Kimi Dake ga Hontou

Rikimaru is a high school boy who is afraid to touch women due to childhood trauma. He had twin childhood friends who were one year younger than him, Kagami the older sister and Kyou the younger brother, who are similar in height and appearance. Rikimaru has a special kind of relationship with them…? This is a unique twin-romance by Yasson Yoshiyuki, a talented artist from the adult manga world!

(Source: Yanmaga, translated)