Fastening Days 4

In Fastening Days 4, Youji, Kei, Kelly, and their trusty bear-shaped robot companion, Oscar, are once again called to action to defend their town with the help of their innovative Fastening Machines. This time, they encounter Samhen, a shy new student in Kei and Kelly's class who struggles to express himself. However, his lively AI robot, Jack, is always ready to assist his human friend in finding the right words.

As the group enjoys a quiet afternoon, an unexpected threat looms over the town, challenging their teamwork and bravery. Together, they must navigate this perilous situation, emphasizing the importance of the connections between humans and artificial intelligence. Will their efforts be enough to safeguard the community and strengthen their newfound friendships?