Fastening Days 4

Youji, Kei, Kelly, and their bear-shaped robot Oscar are back in action, using their Fastening Machines to protect their town. This time, they meet a kindhearted new student named Samhen, who is shy and reluctant to talk about himself. His chatty AI robot Jack helps him communicate, and the group quickly becomes friends.

One peaceful afternoon, a sudden and serious danger threatens the town. The young heroes must work together to save everyone, relying on the bond between humans and AI. As they take action, they learn the importance of trust and friendship in the face of adversity.