Ryouta wa Otouto wo Koroshita

When their mother dies, junior high school student Ryota takes care of his toddler brother Chika and their home. Overwhelmed by all the work, he begins neglecting himself. Without any time to himself, Ryota comes to resent his little brother and soon the resentment turns into murderous thoughts. Little by little the pressures of childrearing make Ryota lose his mind. But is Ryota truly the issue? Or…

(Source: MANGA Plus)