Trying to find a manga. SOMEONE HELP ME PLEASE

I forgot the name of the manga I was reading... So sad...
Someone may recognize, it's a manga about a boy who suffered a lot of bullying from a girl, and one day he gets an invitation to play a mysterious game. The rules are basically: One person kidnaps another and holds her in captivity for a period of one month, the hijacker has the right to do everything with the person, except to kill. The hijacker is required to wear a mask and once a week the abducted person is entitled to give a hint as to who his abductor is, if she hits, she wins the game, if she misses, the game continues until the end of the game period and the hijacker wins. The winner makes a lot of money. The hijacker has a kind of "helper" that takes him form his house to the building where the game takes place.
The boy decides to enter the game and kidnaps the girl who does bullying with him. In addition, there are also 2 more games on the premises of the game, a very psychopathic woman has kidnapped a man and a man, desperate to avenge his daughter, has kidnapped a woman who seems to be good and understanding. Does anyone recognize?
(English is not my first language, so I hope everyone will understand if I've made a lot of mistakes in my text.)