I know you've only just started so I don't have anything in ways of crit to offer, I just want to squee all over Icchan. He is fantastic! I love that you're not afraid to tackle his more serious side... it'd be so easy to make him a one-trick, goofy pony but you manage to make him the serious, smart guy he is when he's in a situation that he's unfamiliar with, while still giving him these moments of silliness without making it seem disingenuous or not fit. That being said, I'm looking forward to when he's a little more comfortable with Kiseki and he therefore can allow himself to act a bit goofier.
Also this is going to be weird praise but I kind of love how you write your tags? Like, you pack in a good amount of information and things for other characters to respond to, without overdoing it. It's really fun to play and stalk you so far! I'm looking forward to more.