A 3DCG anime of Sylvanian Families. The OVA was sold bundled with toy merchandise of the franchise.

Hao Ren was originally a young man who lived in a fourth-tier city and lived on the meager rent of an old house. When he went out to work, he accidentally became a universe police officer. While he was still struggling to accommodate a group of abnormal creature tenants arranged by his superiors, his jurisdiction, the Dream Plane Universe, had already brewed a cosmic crisis. The mystery of the origin of abnormal creatures on Earth and the ruins of civilization in the Dream Plane Universe seem to be connected in some way. As Hao Ren's investigation deepened, the eldest son's world-destroying natural disaster, the goddess of creation fell, and one after another of the dusty and terrifying cases that had been buried for thousands of years bombarded his already useless brain circuit. Hao Ren gradually realized that he might not be able to slack off... (Source: Bilibili, translated)

TV specials of the 1980 colored Kaibutsu-kun series. The first three episodes aired after episode 25. The trio aired back to back on the same day, in honor of Taro Sagami who was the voice actor of Franken. He had passed away the day before. Shingo Kanemoto took over voicing the role after these three eps. The other three eps were all New Years specials aired after ep 57. Each Kaibutsu-kun story is ~15 minutes long. The TV series shows 2 stories per episode to fit into a half hour time slot. These specials are all 1 story each but ep 3 and 5 use the time slot for theirs.