is this really completed. what about his dad?

It's not. The manga is currently on the 8th volume but it has different subtitles:
-Original Series: 1 Volume (Complete)(vol 1)
-Koufuku-ron: 1 Volume (Complete) (vol 2)
-Limit: 3 Volumes (Complete) (vol 3,4,5)
-Shunkashuutou: 3 Volumes (Ongoing) (vol 6,7,8).

ohhh thank you so much for this info.

You're most welcome! I just bought the 7th volume and Taichii dad's issue is starting to talked about.

where can you read them

where can you read them?

I just bought the physical copies.

you've saved me... I had bought the physical copies monthsss ago but I was so confused why it had ended like that. thank you so much! (￣∇￣")

I'm glad I could help! It doesn't help this series has a lot of subtitles, making it so confusing ^^;