Sano is your father. Basically, Akira just wanted to play with the child, and of course, Sano took over everything. Sano often disappeared in his office, or even in the bar, he had no time for you. Finally you decided to approach him, and..

«Akira wanted the child, not me. I am your father only according to documents.»

But as soon as you were about to leave, he called out to you, hesitating a little. «Okay..okay..where do you want to go? Maybe I'll have time.»