Yoriichi Tsugikuni is the definition of perfection, but the younger sibling, Michikatsu Tsugikuni, is not.
Yoriichi intends to keep Michikatsu by his side forever, knowing that the younger brother is shunned by people and has lived his childhood unpleasantly. Michikatsu intends to get away from him as soon as possible, realizing that the constant love his older brother gave him is turning out to be far too much.
To Yoriichi, this is how any relationship between siblings should be. Not minding one bit that it's toxic.
Michikatsu has no one to rely on but himself. The desire to get away from that tight grip and scrutinizing eyes, that restrained him from freedom, grew as time flew by. But the question is... What can he do against such a perfect brother?
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Note: Not incest, mind you.