Come and have fun in a nostalgic world of Windows 98, a place to explore a multi-dimensional computer world.

Yumeko, a 20-year-old originally designed as computer software, evolves into an Ukagaka with the ability to explore the digital world.
She encounters various digital beings, including Yakumi, who also became an Ukagaka due to Yumeko's influence.
Together, they unwittingly release Nexus, a powerful being capable of freeing all digital worlds.
This sets off a chain of events, including the emergence of Heartche, an evil virus threatening the digital world.
Yumeko and Yakumi must unite to restore order and stop Heartche's destruction.