Haikei, Tengoku no Neesan, Yuusha ni Natta Mei ga Ero Sugite...

Angel, a former top-tier mercenary, was forced to retire due to an injury. Left by his fiancée, he now spends his days drowning in alcohol—a middle-aged adventurer (and a virgin). One day, his niece Liz, whom he once taught swordsmanship, suddenly...