"Okaa-san Itadakimasu" seems to be a Japanese phrase. When translated, "Itadakimasu" is a polite way of saying "I receive" or "I eat," and is often used before meals to express gratitude for the food.
The series does not shy away from dealing with mature themes such as loneliness, loss, and the struggle to find one's place in the world. Haqua's journey is a coming-of-age story of self-discovery and learning to appreciate the complexities of life. Okaa-san Itadakimasu
While the literal interpretation is grotesque, literary critics (and generous readers) often interpret the story as an extreme metaphor for codependency and the "consuming" nature of overbearing parental relationships. The protagonist’s desire to "eat" his mother is a physical manifestation of a psychological inability to separate from her—a desire to internalize her completely so they never have to be apart. "Okaa-san Itadakimasu" seems to be a Japanese phrase
In Japanese kao (face) culture, saving a mother from feeling unappreciated is a moral act. This phrase is emotional currency. Haqua's journey is a coming-of-age story of self-discovery
“Of course it is,” she replied. “I’m your mother.”