The world's greatest blue sapphire, the "blue lapis fist", said to have sunk in a pirate ship in the late 19th century, on the coasts of Singapore. A local millionaire plots to retrieve it, and when it's exhibited in an exhibition at the Singaporean Marina Sands hotel, a murder takes place.

Hayashi Osamu, a lecturer in modern Japanese language, presents questions pertaining to diverse fields that the Japanese population should be familiar with. During the program, these questions are posed to guests. As they respond, Hayashi promptly corrects any incorrect answers and offers explanations and lectures.

The team finds solitary houses across Japan using satellite images and ventures to these places investigating the environment and people living in the secluded locations.

In this show, Osamu Hayashi, a lecturer in modern Japanese language, takes on the role of a high school student. Alongside his celebrity friends who act as fellow classmates, they bring in experts from different fields to give lessons.

From easy common knowledge questions to difficult kanji (Chinese characters) questions, Nep League is filled with a variety of quizzes that won’t bore viewers. It’s being watched by viewers of all ages. Two teams, “Team Neptune” and “The Guest Team” will compete against each other. The winning team is awarded the right to challenge the “Mine Train Adventure Game” to win a cash prize of one million yen.