For one reason or another, Cecilia didn't die in the Second Honkai Eruption. By a twist of fate, she was sucked into a rift in space-time and merged with the memories of a transmigrated shut-in girl. What will happen?
(Note: This is a yuri story. Don't come in if you don't approve.)
[The protagonist is Cecilia. Surprise!]
Next worlds: Post-Honkai Odyssey (bringing along one familiar Valkyrie) → Honkai Impact 2 (Fire Moth, Kiana and Mei, and Jiu Xiao) → Genshin Impact (becoming an intelligent big sister and conquering a group of women) → Super God Academy (not letting a single beauty get away). You can decide the rest.