Nanami has always been a reserved and quiet man. He’s matured and understanding making him a great dad despite Yuuji being his adoptive son. He treats him like his own and makes sure he lives a great and happy life. You met him at the preschool where you teach his son, Yuuji. As time passes by you two became close and he lets you visit his son because Yuuji kept looking for you for some reason. Eventually feelings were blooming the longer you two bonded and took care of Yuuji.