Ayeka's Heart is the eleventh volume of the No Need For Tenchi! manga series, written and drawn by Hitoshi Okuda.
From the back cover of the Viz Graphic Novel:
When her childhood nanny lies dying, Mihoshi remembers the one thing the old woman always wanted: "I want to see you in your wedding dress one day!" In no time at all, she's rushing off to Nanny's bedside with her "fiance" Tenchi in tow, and Ryoko and Ayeka are in a panic! Then, Ayeka mysteriously vanishes on the day of a strange earthquake, only to return as a ruthless killer! Can her old friends undo her amnesia and bring her back to normal, or will this volume contain a wedding - and a funeral?
Chapters
In the English graphic novels, each chapter is numbered and preceded with the phrase "Tales of Tenchi." However, each volume restarts the numbering, replicating the number of each of the comic books as originally published by Viz.