(Amazon) Mafia Boss Genichirou Tokada Inukai, leading Asia's largest underworld organisation, completes 108 years of natural life. His inheritance going to his granddaughter totals to 5000 trillion (5 quadrillion yen or 46,560,140,000,000.00 USD). Approximately 360 time the assets of the founder. Roughly 17 times the national budget of Japan. The desire of this unscrupulous daughter who has a non-standard financial power is to... make friends?...

(Source) What do people want if they receive 5000 trillion yen all of a sudden? A young comedy of the dark society, Chifuyu Inukai solves all things with the power of money, a comedy of unprecedented scale (of spending) in all history of manga.

A boy wakes up in a strange room and finds a girl passed out with him. They find out they both have weird collars on. The boy has a phone which seems to be connected to the people behind this. They want them to do what?