If you’ve read redblue you know the gist. Takes place about ch 36

After having received some advice from an opponent he’d beaten in his last match, Aoba sits on a bench and cleans rubs the gross sweaty spots under his gloves which got all soft and stuff. Unbeknownst to him, his one and only fan was peering at him from the corner down the hall of the area of the venue where he was sat.