[Machine Translation] What's the secret of Nikaido, a high-spec friend! Gakuto, the wise fourth son of the Yuzuki family, decides to keep a diary... What is the daily life of the Yuzuki family as observed by Gakuto? And then there is Nikaido, a high-spec boy who is Minato and his friends' best friend. He invites them to a camping trip! What is the secret of his high-spec friends? The world of the four brothers continues to expand!