Guys remember before meeting Marin Goujou is introvert and he is not like average highschool boys who dream to get girlfriend in highschool
So is normal for Goujo to feel very embarrassed to holding hand with Marin in theirs first date especially holding hand in public place
just realized this manga is a reboot of author's previous manga(Isekai Tenseisha Koroshi – Cheat Slayer) that got cancelled
That's why he use alias when starting this manga