The World’s Finest Assassin Gets Reincarnated In Another World As An Aristocrat Vol. 5 (Light Novel)

In Vol. 5, having defeated the third demon, Lugh parts ways with Neusch, who has fallen into darkness, and returns with his party to the Tuatha Dé territory. The royal family’s trust in Lugh and the others has grown with their successes, but some nobles are jealous of that success and begin plotting against the Tuatha Dé family. While carrying out an assassination plot against the remaining demons that threaten humanity, Lugh suddenly falls into a deep sleep and is reunited for the first time in 14 years with the goddess that reincarnated him. What secrets does her beautiful smile hide, and what was the true reason behind her reincarnating him in the first place?
Notice: This book is written in Japanese.