Everything by DATE is just the worst.
Like
Living with Slime, this series invites us to become sexually excited when miserable, self-loathing creeps (in essence) murder the attractive young girls they obsess over. Though DATE's snuff-by-possession theme is softened here, it's still present, and the attempt to present it as something erotic and "interesting" sticks in my craw.
Tanin ni Naru Kusuri is a sex fantasy about boys playing with the corpses of girls they've killed -- at risk [cue
Twilight Zone theme] of becoming girls themselves.
There's probably a good horror series in that premise. Unfortunately, our author seems to share with his male characters the inability to perceive women as people. Nothing here suggests that the girls' lives might matter in any way. They're just bodies fitted with one or two stereotypically "female" behaviors. No one even notices they're gone. The narrative insistence that the victims really
are just disposable objects adds to the story's ghoulishness, but robs it of any other appeal it might possess.
In my view, this series aims for and fully earns the "horror" tag. I'm tempted to argue that "girl's love" and "yuri" are undeserved, because most of the characters view themselves as men in skinsuits. But I doubt many would agree, and I don't care one way or the other.
Bottom line: this sucks and I hate it.