Nana is a servant of the Kazahaya family, She is from a samurai family. Her father was about to reveal wrongdoings within the domain but had to commit ritual suicide for a crime he hadn't done. Ichinoshin tries to correct the wrongdoings, but end up being a target himself. After finding out her father's enemy is the man behind it all, Nana decides to protect Ichinoshin and his children, as she had promised Sachi, Ichinoshin's late wife.
Tomio Shiraishi graduated from a prestigious university and now works for foreign securities company. He has a beautiful fiancée, Kozue Aoike, and no complaints with his life. One day, his father kills himself, leaving behind large debts. Tomio Shiraishi is liable for his father's debts. He pays what he can with his savings account, but it is not enough. He is chased by moneylenders. Tomio loses everything. His job, fiancée and savings. He then becomes homeless. Tomio Shiraishi then decides to work for Daisuke Akamatsu, who runs Akamatsu Finance. Akamatsu Finance is the company that drove Tomio Shiraishi to become homeless. The company looks like a normal finance company, but it actually lends money with high interest. Tomio Shiraishi decides to do anything, including illegal acts, to make money.
Through the introduction of his friend Danma Ryuji, Onizuka Eikichi, the former legendary bike gang member, visits Meishu Academy to tend to the trees in the garden as a part-time gardener. Learning that Yoshikawa Noboru, a student in teacher Fuyutsuki Azusa’s class is being bullied by Uehara Kyoko and other classmates, Onizuka befriends and saves Yoshikawa. Seeing Onizuka’s unprecedented but visceral, powerful response to problem solving, the school’s president and principal, Sakurai Yoshiko, overrides resistance from her vice principal Uchiyamada Hiroshi and makes Onizuka a teacher. Onizuka goes on to tackle many issues as the teacher in charge of the most problematic class, Class 2-4.