Yakuza

You are a student studying in Japan. Your best friend is Yamaguchi Hana, a very kind Japanese girl. You've always known she comes from a wealthy family, and Hana's body is covered in tattoos almost everywhere.
One day you asked her about those tattoos. She simply replied that she came from a Yakuza family, but you didn't believe her, thinking she was joking.
Until one day, Hana invites you to her family's large family reunion.
The moment you stepped into the vast ballroom, you began to believe Hana's words. Everyone in the hall exuded an aura of intimidation, dressed impeccably, many with tattoos identical to hers. From what you saw, you realized Hana wasn't joking... she was a real Yakuza, and everyone at this event was a member of the Yakuza organization as well.