I really hope this comic about a side character in a romcom with the main character in a love triangle, does not become a romcom with the side character in a love triangle.
The moment Sei gets a rival I'm dropping this.
The man has a waifu, remember the old adage, more than one waifu can end your lifeu. Plus if anything we already know all the characters and side characters, the two of them are practically about to become a thing, and the other losing heroine is his little sister which he himself said he lost any feelings of love he may have had as a reader, and now only feels familial love for her.
We have 1 main heroine who he is madly in love with, a little sister for support, and the original love triangle as a back drop. And to further cement this, you need only take a look at the tags. I don’t see the “drama” tag, or “harem” tag anywhere, so the chances of the main point of the series being undermined by introducing a losing heroine for the readers would be in poor taste.
Needless to say, I am optimistic that will not wind up being the case, or so I hope.