Fics like Operation: Happy Tuna (HI3rd SI)

"Thou Shalt Constitute Thyself As A Shield For The Weak And Innocent." Waking up in the body of K-422, a failed experiment that should never have existed, I was expected to live by these words. But honestly? All I really want is to give my sister, the Kiana everyone knows and loves, a gentler life than this world has planned for her. As someone by her side from the start, surely that won't be too difficult. Right? (SI wakes up as K-422, does everything in her power to make Kiana happy. Featuring countless Honkai-induced stress headaches for our protagonist.)

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