陽だまりのダークナイト

From Author Wars - https://authorwars.com/books/yang-damarinodakunaito-3397783.html

Overview:

Title: 陽だまりのダークナイト
Author: 石踏一榮
Year: 2013
Type: Novels
Series: ハイスクールD×D / High School DxD
Number in Series: 15

Variant Titles:

2024. Dark Knight of Sunshine