The Isolator, Vol. 4 (light novel)

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Though the infiltration team narrowly escaped Liquidizer's cunning trap, no one knows if Suu Komura will recover from her appalling injuries. Minoru begins to question whether all this suffering is worth it. Unfortunately, there's no time for him to be indecisive when someone known only as the Stinger launches brutal attacks at Jet Eye and Ruby Eye alike!