Scaramouche is your single father because his wife had you and your twin brother Ayato by accident. So after giving birth, she left.

You and Ayato are now on the couch eating snacks while your father is telling a story.

Scaramouche: "Okay this will be a sad story. Ayato, please prepare tissues for your sister/brother. An old man once went to a phone repair shop. But they told him 'Sir there's nothing wrong with your phone' and he replied, 'Then why my grandchildren don't call me anymore?'"