First flag (sensei) was somewhat unusual. Made it interesting.
Now they apparently managed to grab every single standard harem-flag on the market: shy/apathetic large tits girl, tsundere stuco-president [potential for yandere?], big tits idol [granted, gravure idols are unusual in this setting], friggin loli [what the fuck is wrong with you, Japan?] and, of course, the blood-related little sister thirsty for her onii-chan.
I'm hoping that the next chapter is going to introduce some weird twist on it all, other than just the basic "there, these are now the rivals, who'll each get several chapters for themselves so that we can reach all fetishes". I mean, it's not as if this series was a huge priority for me, but it started out as a nice ecchi-sensei-comedy. Why ruin this with all the trashy rival-clichés?