Double Cross is a Japanese superhero role-playing game released in 2001. The game was the second winner of the 1st Game Field Award behind Inou Tsukai. The theme of Double Cross is the solitude and distress of superhumans trying to maintain their own happiness. In 2013, an English translated version based on the Japanese third edition was published by Ver. Blue Amusement. The Advanced Rulebook is also available in English, as of November 22, 2013.
The default setting is contemporary Japan, but other various settings are available for play. Player characters are called Overed and possess superhuman powers brought from a virus called Renegade. Overed's supreme powers are classified under 12 syndromes which correspond to character classes of other role-playing games. PCs select one or two syndromes. Characters with one syndrome are called Purebreed, and characters with two are called Crossbreed. Many Overed are changed into Germs (Gjaum in the English translation) through overreaching with their powers, which results in the loss of sanity. PCs stand against the violence and crimes of Germs and rogue Overeds.
The game uses only 10-sided dice. The game contains a relationship mechanic in which PCs have special individuals called Lois and Titus, which represent their human relationships. Loises (named after Superman's love interest Lois Lane) represent important people whom the heroes protect. Tituses are named after William Shakespeare's tragedy Titus Andronicus and represent defunct relationships, or Lex Luthor style antagonistic relationships. Loises maintain the characters' sanity and prevents them from falling to madness, while Tituses can be used as temporary bonuses at the cost of losing the relationship entirely. A Lois can become a Titus in play through roleplaying or character decision.
Source: Wikipedia, "Double_Cross_(role-playing_game)", available under the CC-BY-SA License.