I do not recommend Genki at all. The first thing they teach you is numbers, date and time stuff (e.g. someone's schedule, etc), and they do it A LOT, for some reason they really emphasize on this topic.

Liek what the fuck? It is the last thing I want to learn. It doesn't really matter if I can or cannot say/understand "this shit costs over 9000 yen" or "today is Nov. 4, 2024". Who cares. It won't help you to understand h-manga or eroge.