sugar baby are reserve by 1 person
hooker go from 1 to another

how do u prove sugar baby is prostitution??

Different level of relationship.

Anri Akama (Marie Iitoyo) is an ordinary 20-year-old university student. She is kicked out of her home, because her mother has a boyfriend and Anri Akama's boyfriend leaves her. She doesn't have a place to stay and spends time at an internet cafe. At that time, Anri Akama hears from a friend about "Papa Katsu." She signs up on the "Papa Katsu" website to meet men through the site. The men offer money for platonic companionship, including going on dates or having meals together. One day, she waits for a man at a hotel lobby. The man is 45-year-old Wataru Kuriyama (Atsuro Watabe).
From http://asianwiki.com/Papa_Katsu

so u give ur gf money..

she is also a prostitute?

Sugar baby not just for piap la bro..

Papa's daughter (real biological) died earlier in accident, near the end - possibly wife have a hand in the accident - wife suicide.
Papa said "I never love any woman in my life except my daughter, you are the first, and the last." - Open ending.

Wtf did I just read?