This is a visual novel.

Plot Summary

Shu Yu, a popular writer who has no romantic experience but loves writing yuri love stories,
becomes sisters with Lu Xi, an otaku and experienced online voice actress.
Although they share a strong bond,
their relationship becomes awkward due to their own secrets.
However, when Lu Xi accidentally discovers that her favorite yuri author is actually her sister Shu Yu,
she becomes increasingly attracted to her personality
and a forbidden romance unfolds between them.