who is Gramps?, I kinda hinted it in their phone convo:Thanks for the motivating words, @agmoore (ꈍᴗꈍ). So,
"You can't be serious, Aoi, sensei (teacher) is—he can't be dying," he said with finality.
And yeah, I intentionally left their relationship vague because I really find beauty in uncertainty, and as for Aoi calling him Mr. Tanaka, it's kind of work ethic (?) to call your customers that way; may he/she be your friend... Well, I'm not certain if that was necessary—but it's like her grabbing his attention that way... because they knew each other, I just want to give the benefit of the doubt on him (because I'm sure he recognized Aoi's voice, but maybe he's just mistaken?) and as well on the readers' part.
I'm glad that someone has noticed this detail because I'm really fond of mysteries, so I tend to put details such as that. Thanks for the advice, and I'll surely try to apply it to the next prompts. Thanks for taking time to read my writing prompt @agmoore (≧▽≦)!