Light Novel Volume 15

This is the fifteenth volume of the Mushoku Tensei light novel.

Synopsis
He decides to follow the advice of the old man and send a letter to Eris, whom she left five years ago.
 * -|English (MF Books)=THAT ERIS IS BACK!?　OVERCOME THE PAST AND PROTECT YOUR FAMILY! Rudeus encounters his old self, who has traveled back in time from the future. He decides to defeat the dragon god Orsted at Hitogami's suggestion in order to avoid the route his future self has taken, which would cause him to lose all of his loved ones.

"If I ever make it back alive, let's continue our story.

As the story takes a major turn, will Rudeus and Eris be guided by a red thread and begin to cross paths again?.

The fifteenth installment of this life-changing reincarnation fantasy opens here!. "Translated Synopsis from MF books"

"Synopsis from Seven Seas."
 * -|English (Seven Seas)=SECOND CHANCE Rudeus’s brief meeting with his time-travelling future self leaves him struggling to process the terrible suffering that version of him endured. But he might be able to avert those losses in this timeline, if he takes his future self’s advice–starting with reaching out to Eris for the first time in years!

Chapters

 * Chapter 1: The Diary (Part 1)
 * Chapter 2: The Diary (Part 2)
 * Chapter 3: Resolve
 * Chapter 4: Nanahoshi's Hypothesis
 * Chapter 5: A Letter from Afar
 * Chapter 6: Preparations
 * Chapter 7: Readying for Battle
 * Chapter 8: Quagmire vs. Dragon God
 * Chapter 9: Berserker Sword King vs. Dragon God
 * Chapter 10: Eris Greyrat (Part 1)
 * Chapter 11: Eris Greyrat (Part 2)
 * Chapter 12: The Summons
 * Chapter 13: Explanations
 * Extra Chapter: A Wild Blade Finds Its Sheath

Adaptation Notes
Differences from the original web novels

Extra chapter: Mad sword fit in the sheath: New original chapter for the light novel.