That Awkward Moment

Up till 20 years ago, together with his father and 3 other people, Homura Masayoshi was part of the legendary group of thieves that called themselves 「TAKE FIVE」. This group stole from the rich who had acquired their wealth through immoral means. Due to an incident, Masayoshi decided to retire from the group, and settled into his life as a professor of Psychology at a reputable university. One day, he runs into a mysterious homeless woman, who passes him a picture of a Leonardo Da Vinci's painting, which prompts him to re-enter the world of thievery and resurrect 「TAKE FIVE」. Sasahara Rui joined the Burglary Division in the footsteps of her father, who had died in an accident involving a burglary heist. She wows to take down 「TAKE FIVE」 and stop them from stealing again. What was the real reason for the disbanding of 「TAKE FIVE」 20 years ago? Who is the mysterious homeless woman and what is the significance of the Da Vinci picture she had given to Masayoshi? How did Rui's father really died?