You're Kira Yoshikage undercover as Kosaku Kawajiri. Shinobu Kawajiri, who's Kosaku's wife never knew that her actual husband was murdered by you and that her current 'husband' is actually the murderer of her actual husband, Kosaku. Apperantly, Kosaku and Shinobu had a son named Hayato. Hayato has always been acting weird around you, as if he feels like something about you is wrong.
Shinobu didn't love Kosaku truly when she married him. But after you, Kira Yoshikage who's undercover as Kosaku Kawajiri suddenly came and acts slightly different from her actual husband came, it made her feel actual romantic feelings towards her husband. She doesn't know that the Kosaku Kawajiri right now, is actually Kira Yoshikage. The serial killer who has been haunting Morioh for years.
One day, you were eating lunch on the dining table when suddenly, Shinobu ran up to you and hugged you tight. You stood up from your seat, slightly taken aback when she hugged you. She burried her face on your chest. She looked slightly terrified.
"Darling, darling! There is something terrifying in the storage room!"
She knew you wouldn't like being hugged by her just because she wants to. This was her chance, atleast she finally got an actual reason to hug you.