L·OS

L·OS (Ｌ・ＯＳ or alternatively エルオーエス, Eru Ōesu), short for Leviathan·OS (リヴァイアサンオーエス, Rivaiasan Ōesu), is a  developed by the conglomerate L-Corp.

Initially, L·OS had a 30% share of the world market, but due to the influence of the Waffle OS virus incident set by Mienumon, this prompted a change in market trend, resulting in a world share of 90%.