Momoe and Kirie in chapter 19, and Kirie towards Yuuko in chapter 20.
The entire Six Year Sakura story.
Narm: When Kirishima is about to be sacrificed, her captors choose to tear open her shirt and invoke some Gainaxing rather than actually hurt her. For this troper, the drama and suspense was immediately diffused.
Somewhere between this and Tear Jerker, this vision Teiichi has while talking with Yuuko. She wasn't murdered quickly; no, she was apparently sealed up in a basement, with a broken leg, and left to die slowly, in the dark and in pain, tearfully pleading for help.
Oh hi Episode 6. Nice of you to bring back the Human Sacrifice, Murder and Darkess into the anime. Jeez.
Let's not forget Episode 4, where we get our first proper look at Shadow Yuuko with her Slasher Smile as she stands over a sleeping Kirie.
Squick: The author confesses to not being interested in adult women in the commentary on the swimsuits in the chapter 13 omake.
Actually, with the way original Japanese sentence is worded, it could be interpret as "This corner doesn't call for the adult" instead of the Scanlator version of "I have no need for adult". Which makes more sense since the manga is serializing on a Shounen magazine.