The cute little bird I bought at a pet store is a reincarnated sage from another world. 
Given the opportunity to cross to another world with the power of magic, Sasaki brings modern goods to the other world and starts a business. 
While traveling back and forth between worlds - earning money, training in magic, and eating delicious food - he aims to live a leisurely, slow life. But one day, on his way home from work, he encounters an alien being. He uses the magic of the Sage Seal to survive the battle, but his abilities are recognized and he is scouted by the Cabinet Office's Bureau of Countermeasures for Supernatural Phenomena. 
Otherworldly fantasy x battle of super-power abilities x love comedy with an age gap (?). 
There's also a magical girl, a neighbor JC, a coworker JK, a nobleman, a loli witch, a prince, etc… 
It's a story that goes back and forth between the fantasy world and modern Japan, with all the tropes of the genre thrown in.
 
(Source: Bookwalker, translated)

When Sasaki brightens up his tired corporate life by buying a pet sparrow, he never imagined the bird would actually be a reincarnated sage from another world! Could this be Sasaki’s chance to escape his droll office job?
 
(Source: Yen Press)

Sasaki is a middle-aged office worker living in Japan. Feeling drained by the vapid corporate world, he heads to the pet shop in search of a new companion. There he finds an adorable bird named Peeps and takes him home. But Sasaki quickly learns that Peeps isn’t your average bird…he’s a powerful mage from another world! Together, they embark on a magical adventure filled with swords and sorcery. 
 
(Source: Crunchyroll)
 
Note: The first episode aired with a runtime of ~48 minutes.

The second season of Sasaki to Pii-chan.

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