Gundam, Gravity Elegy

One day, Gao Ren is invited to a gathering of the main characters from the Universal Century, the theme of which is their respective mothers.
Since Char had been banned by the administrator Amuro, Little Tomato was the first to express his feelings: My life makes me feel restricted, and my mother has never understood me.
Amuro: My mother didn't understand why I went to the battlefield, and when we met again, she only blamed me.
Camus: My mother was only obsessed with work and never cared about me.
Judo: My parents went out to work and then disappeared. I raised my younger sister all by myself.
Upon hearing this, Little Tomato felt even more pressured, and she had no choice but to turn her attention to the boy who had just joined the group, so she asked him.
Gao Ren: I don't have a father, but my mother loves me very much. I live in a loving family.
Upon hearing this, Little Tomato immediately expressed her envy and wanted to meet that great mother.
Three days later, Little Tomato stood in Sydney Harbour holding a "Best Mother" banner, looking at the tourist sign pointing to the sunken city:
"Visiting now requires taking a submarine."
(Ultimate UC hodgepodge, watchable even if you haven't seen Gundam)