Little Mayu spends a lot of time in her father's hospital, at the bedside of her friend, little Takuma. The latter suffers from serious heart problems and the doctors, despite their best efforts, feel powerless to allow the boy to live beyond the age of twenty. On hearing the news, the little girl swears to do everything to save her friend and to watch over him until the end, promising to marry him when he is twenty... Summary Volume 12: The sudden brain death of a patient. Knowing that his days are now numbered and that the heart operation could also cost him his life, Takuma decides to take his romantic destiny into his own hands and go to Mayu's parents to ask for the young girl's hand. But how to entrust his daughter to such a sick young man...
