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He is the keeper of a giant dragon egg that he refers to as "Baby-San," and keeps in a protective casing in the Far East Animal Shelter. The egg and Obento were abducted by the Foot Clan at one point, so that Shredder could hatch the egg and send it on a rampage through the city.
Obento was saved by the Turtles and Usagi Yojimbo shortly thereafter, and he managed to turn the dragon back into an egg by using a blue candle, which Usagi threw in the dragon's mouth. After that, he volunteered to take care of Usagi until such time as Donatello could open a portal back to his home dimension.
However, his life was thrown into further turmoil, as Shredder's goons abducted Obento on the way home from the grocery store, and the old man was held hostage to force Usagi to kill the Turtles. He was later freed by Usagi, and returned to his duties at the animal shelter.