行ってまいります
Meanings
1
goodbye (when leaving home); I'm off; see you later
Polite phrase said when leaving one's home or office, often to family or colleagues. Implies the speaker will return. More formal than 行ってきます.
See also: 行ってきます
Saying 'I'm off,' he left the house.
Every morning, I say 'I'm off' to my wife.