I Can't Believe I Became a Servant After Exploring a Haunted Mansion and Now I Have a Harem of Girls who Wanna Have Sex with Me Whenever I Want!!!

I Can't Believe I Became a Servant After Exploring a Haunted Mansion and Now I Have a Harem of Girls who Wanna Have Sex with Me Whenever I Want!!! (お化け屋敷を探検するのあとサーヴァントになっちゃったやいつでもセックス欲しい女の子のハレムがある信じられません！！！ Obake-yashiki wo Tanken suru no Ato Servant ni Nacchatta ya Itsudemo Sex Hoshii Onnanoko no Harem ga Aru Shinjiraremasen!!!, SavaHare for short) is a light novel starring Demetrios Komnenos as he travels the world in search of knowledge, power, and wisdom, meeting (and fucking) a diverse harem of girls along the way.

It is adapted from the story of a subplot known as Island Hopping.