From MangaCity: Redrum 327, a manhwa by Ko Ya Sung, plunges readers into a world that's a cross between the "Scream" franchise and Stephen King's "The Shining." It tells the tale of a group of friends who plan an impromptu visit to an isolated chalet in the mountains. Their weekend getaway starts out as a pleasant idyll, but as the evening progresses, tensions rise, rifts form and conflicts occur. Soon they start to experience strange disappearances and hallucinations, and that's when their trip turns into a real nightmare.

From Evil Flowers: Oneshot Lisa is deeply in love with her senpai. She became a coach at her school's archery club hoping she'd get a chance to get close to the senpai she loves. One morning Lisa visits a small shrine and prays for her dream to come true... not knowing the fact that she should be careful what she wishes for...

Here's a temp description: Guy with crazy armpit fetish gets a ring that gives him a demon that is there to pleasure him, and he starts off by going ham on the demon's armpit