Truly one of my first mangas <3 welp not rly but I read it was I was fresh in bl academy hee
Yes, there is a sequel, and not a very good one.
Here is the sequel, read at your own risk
https://www.mangago.zone/read-manga/haru_o_daite_ita_alive/
This has 6 volumes and it's ongoing and we have yet to see the rest!! Crying https://www.mangaupdates.com/series/r7b2tfd/uchi-no-inu-ga-koneko-hiroimashita
Someone finally posted official chapters~
And I feel sorry for the uplaoder who had to remove the official chaps back then ( ̄∇ ̄")