Upon waking, Nobita finds himself sixty years behind in technology. In the town of Tsukimidai, all memories of Doraemon vanish along with the regressed era. After a series of twists and turns, Nobita and his friends learn the truth: an unprecedented, massive, and trans-temporal war is unfolding, its target the future where humanity's technology is booming. The dominoes hidden in the past have already fallen, about to form a colossal wave that will engulf every era of humanity. The only clue is a snapshot taken across time. On September 19, 1492, at the center of the temporal vortex, the Time Police captured a photograph of the back of a blue nursing cat-shaped robot. This becomes the catalyst for Nobita and his friends being drawn into this trans-temporal heist. As they uncover more and more clues across different eras, a massive conspiracy gradually surfaces.

When a musical prodigy comes to the other side of the sea to pursue his dreams, he unexpectedly becomes a teacher at the Moon Forest.

What?! Me, a grown man, going to teach at an all-girls school? Really?

What? My students formed a rock band? Really?

What? The keyboardist ran away? The band broke up? Is it true?

What? My student has formed another band? Really?

What? My student is lost? What does that mean?

Amidst repeated shocks, Du Feng, holding the brown-haired girl in his arms, suddenly realized...

Wait a minute? Wasn't I supposed to be forming a rock band? Where did this come from?