Mizu no Iro.

Paradise is a city where the boundaries between life and death blur into one. Within this unsettling landscape lives Lithia, a young boy afflicted with amnesia who has no memory of his past or how he came to be there. His only companion is Setsu, a scarred hitman who serves as his caretaker. Despite his violent profession, Setsu treats Lithia with a gentle kindness, always dressing the boy in red clothing. Yet beneath this domestic routine lies an undercurrent of instability. Setsu frequently laughs in a fragile, desperate manner, as though he might shatter into tears at any moment—a volatile behavior that leaves Lithia deeply uneasy and constantly on edge. Their precarious daily existence is abruptly disrupted by the arrival of Romanée, a mysterious man whose presence threatens to unravel everything. Romanée appears to possess an intimate and dangerous knowledge of Setsu’s hidden history. As this stranger forces buried secrets into the light, the fragile sanctuary the two have built in Paradise begins to crumble, leaving Lithia caught in the crossfire of a past he cannot remember and a protector whose own mind may be fracturing.