Is this from a manga or just an art? Can someone tell me the title of this pls https://ww...

I think that it's a manga that's being made. I assume that this is the authors' twitter since they've drawn the characters before:
https://twitter.com/zackey_hp

i think it's a doujin or fanart of samatoki & ichiro from hypmic

Thank you all (づ￣ ³￣)づ