Solitary Confinement Playing Card Game Venue Information Difficulty Jack Category Hearts Status Cleared Players Oki Yaba, Sunato Banda, Kotoko Shiga†, Eiji Mitsurugi†, Kunio Kariya†, Ippei Oki†, Kassai Rokudo†, Masaki Aizen†, Urumi Aramaki†, Kakeru Kishoin†, Rui Hibino†, Meisa Tokui†, Motohiko Kaneko†, Akitomo Mino†, Genki Kiriu†, Akifumi Seto†, Unnamed Players (x3)† Citizens Enji Matsushita†

The Jack of Hearts, also known as Solitary Confinement, takes place in a penitentiary. It is run by Enji Matsushita. It was completed by Sunato Banda and Oki Yaba.

Player Limit: 20 (Technically 19)

Time Limit: 1 hour/round

Players must equip an explosive collar upon entry. Players also may not bring in any reflective surfaces or materials. Before the game begins, a mark appears behind each player’s collar, renditioning everyone unable to see their own mark (Spades, Diamonds, Clubs, Hearts).

Game Clear: Kill the Jack of Hearts

Game Over:

In the prison, there are no reflective surfaces. All knives in the kitchen are ceramic, faucets dispense tomato juice, and there are no mirrors. Since the penitentiary is so large and spacious, it is subtly encouraged for players to have discrete conversations discussing claims and strategies. Since there was a half year’s supply of food stocked, it was initially believed that Solitary Confinement was meant to be a game of attrition.

The identity of the Jack of Hearts was Enji Matsushita. This was deduced by both Sunato Banda and Oki Yaba after they formed a sudden but strong alliance and saw that Enji was the last remaining player, and uncovered his tactics.

Near the first few rounds of the game, 3 apparent factions began to form: the group, partnered players, and loners. The loners were the first to all gradually receive Game Over. However, the group soon followed as Urumi began manipulating everyone to lie to those who had even the slightest suspicious tendencies. In the end, the partnered players were the ones who lasted the longest. Finding a partner and staying with them was among the best strategies to clear the game. Near the start, it is guaranteed both parties will only announce the correct mark, since lying would draw heavy suspicion. Near the end, should they trust each other enough, they would be able to deduce the identify of the Jack of Hearts from seeing who the final player is. Staying with a group seems to be the most practical option, but it wouldn’t last long due to how easily swayed people can be. Once 1 person has been killed in the group, then no one else in the group can be trusted, not alone or together. Going alone is suicide, especially towards the endgame. Towards the end, a 4th faction forms. It’s another group with Mitsurugu as its leader. His intent was to drag the game out until the food ran out. Even if the Jack of Hearts was within the group, they could live in peace for half a year. At first glance, Mitsurugi's intent to seems humane. However, it holds a massive flaw: this would kill the rest of the players outside the game within a month as their visas expire with no mean to clear the last game. Ōki eventually quells the group by tricking Kariya and shoving him into the same cell as Mitsurugi, a forbidden action. As stated by Urumi and Mitsurugi respectively, the longer the game goes on, the worse off it is for the players. Even if there seems to be nothing out of the ordinary, the Jack of Hearts is convening and setting up their master plan from round 1. At the time it seemed like intense thinking, but it was all true and greatly foreshadowed at the Jack’s identity. It would be unwise the drag the game out for more than a dozen rounds, but players should still be as careful as possible.