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Zaizen wants to join the baseball team of the school he has newly enrolled in, but he is deceived into visiting the secretive investing club instead.
Zaizen gets to work to make back the 30 million yen he lost, but quickly discovers he still has much to learn about stocks, and about money itself.
Zaizen discovers that the reason he was invited to Miyuki's house was to meet her grandfather, who runs their school and has much to tell him.
The girls of the club are visiting Tokyo when they happen to run into Takako's cousin, who is applying for jobs and could use a little of their help.
Zaizen decides he should use the club's assets for venture capital investing, but first he needs permission from their owner, Miyuki's grandfather.
The club finds Ren passed out on the floor. When he comes to in the hospital, it gives the club a chance to discuss working life in corporate Japan.
Ren's school learns about how his aunt uses her incredible social skills and memory to excel at her job as a top insurance saleswoman.
Takako's mother decides to go into the coffee shop business, which is a worrying career move not just to Takako but to the other club members as well.
With the very existence of the investing club on the line, Zaizen agrees to an investing duel with Takako's older brother, the Fujita family heir.
The first round of the investing duel is in real estate. Zaizen begins with a visit to a real estate agent and begins looking into various properties.
The second round of the investing duel is in the foreign exchange market. With the club's help, Zaizen learns an important lesson in leverage.
The final part of the duel is a market cap battle, in which the two must select a list of companies with market caps that add up to 100 trillion yen.
