The game will be available in both a 2,750 yen standard edition and 7,150 yen Premium Edition. The Premium Edition will include a newly-illustrated B2 tapestry, newly-written short story, and the Amamane original soundtrack.
Here is an overview of the story, via VNDB:
Even though Seiichi was better at baseball than everyone else, he was unable to perform at his peak during games due to his nerves. He trained hard by himself to get over his stage fright, but it only resulted in him overworking himself and collapsing on the scorching grounds. His kouhai Satsuki held him in her arms and told him:
“I’ll become your girlfriend and your manager and support you fully so that this will never happen again!”
Thus, she started helping him with everything, from his practices to his private life. Naturally that includes lap pillows and homemade bentos, but sometimes also having sex.
“You’re too harsh on yourself, senpai. So I’ll pamper you in return.”
Seiichi was happy for her affection, but he wished to give it his all during training. Satsuki believed in his true strength, but she wished for him to be happier. Their youth time match starts now!
Update 08/16/19 at 8:35 a.m.: Amamane will also be released digitally for PS Vita on November 28 in Japan. Visit the newly launched official website here.