撲 eradicate

It's a violent kanji, so we can think of the hand as a fist. So :

The business of BOKU no fist is eradicating posers.

eradicate ☆☆☆☆☆
撲 (eradicate) + 滅 (annihilate) = 撲滅 (eradicate)

eradicate (a pest or disease) 'The new task force will eradicate drugs once and for all!'

Sumo ☆☆☆☆☆ CCWFP
相 (partner) + 撲 (eradicate) = 相撲 (Sumo)

Sumo. I've seen a bunch of of straight porn featuring 'sexy sumo wrestler girls,' but I've been unable to find a single gay sumo porn. Which either means, a) gay dudes think sumo are trolls, b) gay dudes have too much respect for the manliness of Sumo to do a x-rated parody, or c) gay dudes just jerk it to regular sumo on the tube for free.