I fell in love with this adorable story and characters. I recently found out that Kouji Miyata has passed away and was sad, but I feel like the best thing I could do to honor him is to share his amazing work.
This is a sweet romantic comedy about the life of a man and his alien wife; there is an adult content warning on the manga, but this is because all of the aliens wander nude and display a wide variety of breast shapes and sizes rather than anything more explicit. It's a particular domestic fantasy -- wife, kid, in-laws, sexy neighbors whose advances are always turned down, wacky hijinks, loving family life -- where the fact that the wife has star-filled eyes and innumerable prehensile tentacles in the place of hair is an almost incidental detail. (It's not even sexy tentacles; the husband is definitely more of an ass-man.) For all that it's not a very alien story, and is deeply invested in traditional gender roles for even the most alien of its characters, it's still a fun comedy about a happily married couple, and very enjoyable for just how much it loves how in love the central couple is.
Unfortunately, the mangaka, Miyata Kouji, passed away in 2015 at the age of 34. This is why people say that the ending feels rushed. He had two series being serialized when he fell ill, Why Not Be My Dog? and Oh, My Sweet Alien! He knew his diagnosis was terminal so he did wrap up both series on his terms before he passed away, with both series final tankobans being released about a month before he passed. So both series are complete, albeit somewhat shorter than he planned for them to be.
There are only two volumes so it isn't a long read. So please just take a little time out of your day and enjoy this sweet story.