We step away from the Kawamoto sisters this week, but we see their warm caring nature reflected in Rei as he takes care of Shimada. Flashbacks indicate he’s had often-crippling stomach pains since he was a teenager, likely due in part to the pressure his small but well-meaning village put on him to become a master. He doesn’t want to let them down any more than himself.
The Lion King Tournament with Souya is really doing a number on his already shaky health, so Rei comes by to make him a delicious udon bowl, stating his father (not Kouda-san) had the same stomach problems. Rei doesn’t cook for himself at home, but he’s happy to do it here, and is actually good at it. I can just imagine Hina’s joy (as well as Akari and Momo’s, but particularly Hina’s) if he whipped up a bowl for her!
Rei goes against his better judgement and acquiesces to Shimada’s demand to play shogi with him, despite the fact what the dude needs most is sleep. But Rei is flattered to hear the reason why: like Souya, Rei is an all-rounder with similar “viewpoints” on the game Shimada can’t get elsewhere. Rei may be a stopgap (i.e. nowhere near as good) but he’s better than nothing. Souya even used the same word to describe the 3-g silver (or whatever) move: “disturbing.”
From his house, Rei gets Shimada on the shinkansen, into his hotel room, and thanks to an altruistic assist from Souya, Shimada’s role in the pre-match reception is mercifully brief. The day of the match, Rei still second-guesses staying and playing with Shimada instead of insisting he rest back home, but there’s nothing he can do about it now. All he can do is hope Shimada has enough left in the tank to grab a win.