noun
sense of mission; sense of duty; vocation
A strong inner feeling that one has a duty or calling to do something, often used in professional, social, or personal contexts.
彼は強い使命感を持って仕事に取り組んでいる。
He approaches his work with a strong sense of mission.
医者としての使命感から、彼
Out of a sense of duty as a doctor, she headed to the disaster area.
義務感 is a feeling of obligation or compulsion, often less voluntary than 使命感, which carries a more positive, self-driven connotation.
Compound of 使命 (mission, duty) and 感 (feeling, sense). The exact historical derivation is straightforward; the word is a modern Sino-Japanese compound.