Al and the Id

In book 5 of the SONS OF STEEL series, AL AND THE ID, Alice and Secta face their greatest challenge yet - defeating En-Lil, the puppet master of Zen Corporation. The stakes escalate when a phantom species, the Id, infiltrates Alice's girlfriend, Sonoko. Realizing they share a common enemy, Alice allies with this spectral entity, Neit, the last of its kind.
Their alliance stirs En-Lil's wrath, summoning a terrifying demon, Gaap, to quash their rebellion. Outgunned, the team makes a bold move: they send Alice to Eris, En-Lil's suspected stronghold. But Alice must face a perilous gauntlet: seven powerful demons guarding En-Lil's fortress. The ultimate battle for humanity ensues, as Alice squares off against these formidable foes to reach En-Lil.