@LGear
You do know that it is entirely possible that you have completely misinterpreted what I said, right? Apparently you haven't read enough of my posts to know that I actually detest the Love Triangle trope and have railed against 3rd wheels in many of my posts all over mangadex. Suggesting that I
want a Love Triangle is like suggesting that I'm not a pompous git.
As for the "new direction" the series will go in if the dude becomes a regular, daily member, it's quite obvious that the dynamics of the Shogi Club would change with new members attending. It is most probable that the main pair would no longer be so overt with their "flirty" behavior while in the clubroom. I can imagine that it would get even more frustrating for Senpai interfering with her alone time with Ayumu.
@Raidou94
nope actually the love is mutual...
Well, I can't argue about that as I don't remember if we've been blessed with any backstory about them other than the last chapter.