Arachi: First Irregular

Briefly about Arachi: First Irregular manga:  Arachi, a woman with mysterious origins and unearthly powers, has been living an ordinary life as the wife of HS Group Chairman Soo-hyuk. While on their way to Gangwon-do in a limousine with her family, they get hit by a truck. In order to protect her sons Seon-mi and Soo-hyuk, Arachi summons her dormant abilities and awakens her true nature as Sunmi: a protector of mankind with incredible strength.