
Hey guys I found the Chinese RAWS for vol 2, u guys should check it out, I mean it does explain so much about vol 1 (though I can't understand Chinese but the situations on the pictures does explain a lot, would be better if we can read & understand).
P.S. This website may load a bit slowly, and if you guys encounter another website for same vol 2 make sure it's 94 pgs not 80 pgs cause its missing scenes that explains stuff. Otherwise enjoy vol 2 below.
http://m.manhuatai.com/taiyangqishiwanjiepian/qyj.html
Spoiler:
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Sad and happy ending, quite a satisfying ending but would be nice if it had another volume or longer then it would definitely be even more better. (づ ̄ ³ ̄)づ

I found this link with less to no ads and scroll down viewer. I think it's only up to ch 28 split into 3 parts, so it goes like; ch 29 = 28/1, ch 30 = 28/2, ch 31 = 28/3. Link below.
http://m.buka.cn/m/103763
For ch 1-29,no scroll down viewer,less to no ads, link below.
http://m.iyouman.com/2480/
Enjoy ヾ(☆▽☆)

Try the Chinese RAWS links below [I suggest reading these in an 'Incognito' tab/s from Google Chrome web browser or something similar to it, just to be safe]:
I recommend this website cause it pretty much has no ads and it's scroll down, chapters up to 50: https://www.manhuaren.com/manhua-sha-x-xiajingshu
This one has a bit of ads in it, so I suggest to just check out chapter 51 on this website: http://www.77mh.com/colist_238967.html
ヾ(☆▽☆)

I encountered a few websites that have this mangaka's old to new works, they are ebooks though and the website is in Japanese. This website below for example:
http://renta.papy.co.jp/renta/sc/frm/list?suggest=on&word=%BC%B7%C0%A5%A4%AB%A4%A4
If someone out there can read, understand and knows how to use one of those websites, then it's possible to get the raws and possibly someone who may be interested to translate them. Then I'm glad I shared this info.

Thanks for the link. I haven't bought the copy since I can't read japanese, but from what I could understand with the mtl-ed comments in the site it seems as if this sequel focuses more on the development between hinata and kageyama's relationship. I guess hinata did not end up with Al. Though I am not entirely sure about the accuracy of google translated comments ┑( ̄Д  ̄)┍
Heya use one of these 2 Korean websites for Adonis, warning there are inappropriate ads there. (Can also use these websites to check out other webtoons, it's in Korean though)
https://toonkor.win/아도니스
https://cointoon.net/comic/1961/아도니스
Enjoy!!! ヾ(❀╹◡╹)ノ~
You are amazing!