Tsugumi Rosenmeier is a shy girl with a sad past, and her elemental power is the ability to explode things from a distance when her heart rate reaches its maximum. Always estranged from friends and family because of her power, Tsugumi still does not have full control, sometimes creating accidental explosions. This scenario changes when Tsugumi joins with DEAVA and finds an admiration in Lihua, who encourages her throughout her time in the organization. In fact, Tsugumi expresses affection more for Lihua than any other individual Element.