First of all, install the free DLC.

https://psteamproxy.yuanyoumao.com/app/1293240/House_of_Detention__Adult_18_Patch_FREE/
Play House of Detention and Male Forest chapters to get 3 buckets and 1 scroll and die twice in each. After that, go to Additional Content from the main menu and start each of the three maps. Finally, at the top right of the main menu, select Custom and change each of the characters to play with them.

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