The Raven Dark Hero ~I Longed to Be a Hero but Due to This and That I Became the Last Boss?!~Shikkoku no Dark Hero ~Hero ni Akogareta Ore ga, Areyo Areyo to Last Boss ni!?~ ; 漆黒のダークヒーロー～ヒーローに憧れた俺が、あれよあれよとラスボスに！？ ～