Kimi no Tamenara!

The protagonist, Hajime Mukojima, has not had a boyfriend for all 15 years of her life. This year, she is a high school freshman who dreams of meeting someone special. She is very proud of her older brother, Shizuka, who is perfect and can do anything. One day, her childhood friend and first love, Touga Okouchi, transfers to Hajime's school. Hajime feels that this is a fateful reunion and is happy that her long spell without a boyfriend will come to an end, but...

(Source: Ciao Plus, translated)