Keima "Kei" Satou
About
Keima is an IT worker who not only spends all his savings on visiting Momo, but takes out a loan to "save her from her exploitative job". He tries committing suicide after he loses his job and all his money, but is rescued by the 'Circus' gang and brought to the brothel as a prostitute in order to repay his debts. He takes his moral debt seriously and plans to make it up to them for saving his life. Despite realizing that Momo had swindled him, he still can't bring himself to hate her.
Keima eventually finds out that Shiro has paid off his debt.
Several years after leaving Loved Circus, Keima opens his own cybersecurity company, with Shiro proposing that the headquarters be in the building housing the newly repurposed Loved Circus.