Spoiler please
I'm gonna copy-paste the explanation a friend gave because it's exactly what I thought from looking at the raws.
SPOILER!!
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"Ikuro ends up with Norihiko, and they're in a small house, with Ikuro being in the role Ranzo once had, and Norihiko being Ikuro and Ranzo's father. The scene that Ikuro once witnessed as a child, (Ranzo being the mantis who was eating their father alive), Ikuro is now the mantis, eating Norihiko. (Not real cannibalism.)
I'm not 100% sure but the way I see it, when they use the term "being eaten", it's the way he witnessed Ikuro and Ranzo's father being so obsessed with Ranzo's beauty that he spends day and night with him like a crazed man, and since he could never have his father's love and obsession like that, he makes Norihiko the one he eats. Ikuro has never gotten over the lack of love from his father, the unfairness in attention. Now he has someone who can give him that, and he willingly becomes the mantis who eats Norihiko."
So yeah, no happy ending (which was expected) but pretty much the pattern just never breaks
This is so tragic and beautiful ar the same time
That's actually a solid ending for a fucked up manga
I already know the ending and it sucks lol obviously I thought it would happen because this is a fucked up story, but still I was disappointed