If you're looking for anime similar to Happy Come Come, you might like these titles.
Yuuto Matsubara is a 27-year-old man who works in the sales department of a major toy maker, but he isn't able to pursue his dreams, and he feels hollow every day. He's even given up on love with his childhood sweetheart Ai. One day a "Time Driver" robot that runs on the power of dreams appears in front of him, and he is forced into the cockpit against his will. Inside is a 12-year-old version of himself.
MechatroWeGo are robots that kids can pilot and operate. Satoru pilots an old WeGo that his grandmother gave to him as a gift. When the kids gather in their secret base to race their WeGos, Satoru can't take the first step. Satoru's classmate Akira invites him to race again. This is a story of boy and his robot, set in a seaside town in the near future.
In a future not too far from now, humanity has advanced to a point where the line between Homo Sapiens and Androids have blurred completely. This has occurred so that the species could survive. Technology has allowed humans to travel into deep space to colonize other planets and galaxies deep in the universe because Earth has become uninhabitable. One of the many unfortunate results of this robotic Darwinism is that human behavior and consciousness has also changed over the years. Much of what makes one human -- love, family, intimacy etc., have all become things of the past. Almost legend...
Oyone, who moved into a group home for senior citizens, forms a band with the other elderly residents. She relives the memories of her youth through a concert on Christmas night.
A young girl named Miru and Ran, a boy who appeared before Miru, embark on an adventure in an alternate world — but something tragic awaits them there...