Volume 4

Attack the 13th Sun! (十三番目の太陽を撃て) is the fourth volume of the Mondaiji Light Novel series.

Book Summary
After Leticia was abducted, the Gift Game —— 「SUN SYNCHRONOUS ORBIT in VAMPIRE KING」 begins as well! While facing the highest difficulty gift game without any victory conditions, the giants on the ground attacks “Underwood” once again, and a roar from the “pure-blooded dragon” came from the sky. Seemingly a dead end, You Kasukabe’s only choice is to intrude the ancient vampire castle, where Leticia was in. In the sky castle where even neither Izayoi nor Black Rabbit can get to, can she attack the thirteenth Sun, and successfully clear the game —— ?

Chapters

 * Prologue
 * Chapter 1
 * Interlude, Part 1
 * Interlude, Part 2
 * Interlude, Part 3
 * Interlude, Part 4
 * Interlude, Part 5
 * Interlude, Part 6
 * Interlude, Part 7
 * Interlude, Part 8
 * Chapter 2
 * Chapter 3
 * Epilogue