This is an Agave schidigera "Shira ito no Ohi", right.......... nickname: Queen of the White Thread. I think I knew someone that did drag by that same nickname.
Love the coloring of the dark green with the white border and the silver like filament threads on the leaves. This will be an outstanding specimen when it grows larger up to 12", its in a 4" pot in this photograph. This plant takes full sun. USDA hardiness zone 9 to zone 10.