Lena, a junior-high student in 21st century Tokyo, is a core member of ALICE-3. This team maintains peace within Cyberland, the digital realm. Alongside Alice Minazuki and Juri Yagami, Lena deploys a specialized dive system to enter Cyberland's eight-level structure, where higher levels hold more confidential data. Her operations involve investigating systems, gathering intelligence, and combatting enemy guard programs using a straightforward battle system based on attack, defense, and character switching.

Identified also as Rena Ohtori, she collaborates with Alice and Juri to counter criminal cybernackists threatening the network. The team operates under the guidance of the mysterious Lucia, who recruited them to form a fighting force against these threats. Lena is a friend of Alice, the daughter of one of Cyberland's developers. Her role consistently focuses on team-based cyber operations across official media.