Honkai Impact: My Sister is a Paramecium

In 2006, Siegfried didn't just rescue experimental subject K423—he also saved the lone survivor AX0369. Born with the genes of Siegfried, Cecilia, and the Honkai Beast Vishnu, AX0369 was deemed a failed experiment. After a fateful incident, Siegfried named him Zeya Kaslana while entrusting his daughter Kiana's name to K423. But Zeya harbors a terrifying secret: personally chosen by the Honkai as an apostle, he can absorb any energy and evolve endlessly. In a world where humanity fights for survival against cosmic destruction, one "failed" experiment may become either salvation or catastrophe.