even though
決戦前夜だというのになぜ?
Why, of all times, on the eve of the decisive battle?
— ロード・オブ・ザ・リング/王の帰還 (2003)
皆留守だというのに、不思議なことに家中の電灯がついていた。
Strangely, all the lights in the house were on, even though everyone was away.