Effy: One of Unreasonable "If" is a Japanese 3D flight shooting game set in a post-alien invasion Earth where military corporations vie for control of extraterrestrial technology. Players take on the role of Navaho, a mercenary test pilot recruited by ICKX Military Research to operate the Y1 combat aircraft. The game features a fully voiced narrative and combat mechanics centered around two specialized systems: ACS and RCS, which players must master to dominate aerial battles.