It's simply a series of loli erotica aimed at masochistic gentlemen (with occult themes). 
 
(Source: Afterword from chapter 3) 
 
Chapter 1 
A loli succubus relentlessly milks her prey. There are worse ways to go. 
The last is a sweet sweeeeet sweeeeeet happy ending. 
 
Chapter 2 
A cursed doll appears in the room in this tale of sweet reverse NTR and sacrificed life. 
 
Chapter 3 
Being sexually played as a toy of two girls who you meet in a hot spring resort. 
 
Chapter 4 
Three girls sexually bully an oniichan. 
 
(Source: DLsite English)

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