My father's business trip: One night and two days with my stepmother

Kaoru has married Takashi, a man she met at the restaurant she works for. Takashi is divorced, and she has only a son, Kenta, and Kaoru's first marriage became a mother of one child. However, Kaoru was worried about how to deal with Kenta, who was already quite old. One day... Takashi ends up leaving the house on a one-night business trip. Kaoru, who wants to become friends with Kenta after this, asks a question she has about Kenta...