Before becoming the president of Tennouzu Group, Kaguras mother had been an aspiring model who was scouted by a woman named Goutokuji. Her body was remodeled by Dr. Kazuki Odawara, whom she soon fell in love with. Despite her success as a model, she chose to leave it all behind and marry Kazuki. However, on the day of their wedding, Shinsen signed their marriage licenses but waited for several days for Kazuki to arrive at a hot spring. Unfortunately, he never showed up, leaving Shinsen bitter and resentful. She saw Kagura as the ultimate symbol of her betrayal and cruelty towards others. Despite this, she seemed in love with Suitengu, whom she believed was a replacement for Kazuki in her loneliness. However, despite being incredibly cruel to many people, including Kagura, Shinsen showed kindness only to Goutokuji, whose injuries she believed were her fault.