Hell is Dark with No Flowers Vol. 2 by Yoru Michio

On the way to the store from a certain mansion, Seiji is attacked by a young woman attempting to find the mansion and it's master. This is bad enough but then he is attacked again by a young man who drops a bombshell on both Seiji and Shiroshi; his name is Aka and he's not only Shiroshi's youngest brother he's angling for Seiji's job and if Seiji has to die for him to get it, well, that's even better. To make matters worse, Shiroshi receives a summons to a mystery island requesting he join the occupants to witness a dismemberment...

This volume delves a bit more into Shiroshi's background and how he ends up becoming Gorouzaemon's heir. It's not pretty and is almost identical to Odoro's story, which is extremely sad, especially since I can't imagine Shiroshi would have wanted to become heir in that manner. I feel bad for him, and honestly, after this volume, I'm more than positive that Seiji is the brother he needed all along, and Shiroshi just didn't notice it. 

The mystery in this one is an actual locked room mystery that clearly pulls from Christie's And Then There Were None, but is so much more twisted than hers. We again have another extremely messed up family, except this time, there seems to be some sort of outside force leading them to do things that they otherwise may have thought about but never acted on. Although, I will say I do not blame Riko in the least, not even a little bit. You'll get this when you read it, but trust me Riko snapping was only a matter of time, what she does afterwards, however, is something I don't believe she would have done without this outside influence.

I genuinely can't recommend this series enough, and if you follow me on Bluesky, you are probably getting sick of me talking about it, but it's truly an exceptional nod to the classics in this genre.