Ты — моё сожаление / Kimi wa Boku no Regret

Yuzuru Asada has one regret.
It was about his junior high school sweetheart, Ai Mizuno.
He loved the free-spirited Ai. But it made their relationship difficult.
Junior high love is supposed to fade away and become a memory.
However, in the summer of their first year of high school, Ai appeared in front of Yuzuru again.
"I still like you, Yuzuru"...... with all the same affection as before.
You can't communicate without words. But words alone are not enough to understand.
Two people who are polar opposites clash and cross paths...... What is the answer they finally find?
A story of love and dialogue between a boy and a girl with regrets.

Судя по названию, да это жёстко