The RoboCup Soccer Simulation 2D League is the oldest of the RoboCup competitions. The 2D soccer simulator enables to teams of simulated autonomous agents to play a game of soccer with realistic rules and sophisticated game play. This paper introduces the RoboCup 2018 Soccer Simulation 2D League champion team, HELIOS2018, a united team from Fukuoka University and Osaka Prefecture University. The overview of the team's two recent research themes is also described. The first one is the method of online search of cooperative behavior and several approaches to acquire the appropriate evaluation functions. The second one is an opponent analysis in order to adopt the team strategy to the current opponent team online.
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