That is the shittiest ending in my life. Mariko deserves more. The whole manga is based on unreasonable mockery. This character didn't deserve it in any way. The ending is just awful. It was fun to read, but this is one of his worst works because of the ending. It's a fucking waste of time.
Romanus if you're reading this, then my congratulations, you wasted your time. Write to me on VK.