This article presents the concept of unlimited fusion-energy station (U-FESTA), comprising a fusion power plant and a lithium (Li) recovery facility to recover Li from seawater, for example the Li-separation method by ionic conductor (LiSMIC). To realize the U-FESTA, we discuss the relationship among the seawater-based Li-recovery efficiency, blanket technology on 6Li enrichment, intake cooling seawater in a power plant, and the blanket-replacement period.