Wasurenagusa ni Kuchizuke wo

This is an important record of me, a crybaby, and you, like the sun.

Nohara Mio and Sonomura Shin have been childhood friends since elementary school, living next door to each other. In contrast to shy Mio, who is not good at socializing, Shin has many friends and is popular with the opposite sex. Mio has always had feelings for Shin that are more than just friendship, but he keeps them hidden deep in his heart and does not confess them. After a certain point, Shin's memory loss becomes more severe. In fact, he has been suffering from an illness caused by an old injury. Shin gradually loses his memory, and Mio supports him. Travel, love, photography... What will be the end result of this relationship that is woven together while misunderstanding, hurting, and struggling...? This is a story that depicts the ten years of two childhood friends.

(Source: Thirdlinenext, translated)

Note: Includes one extra chapter.