Ooh, the start of a saga of raunchiness and debauchery of a young man thrusted into power and prominence, and it's by Nishizawa Mizuki. I'm a very happy reader now.
Ohhhh ..... Kayyyyyyy. What we've got here is (in no specific order): (1) MC is virtually a self-proclaimed NEET who initially refuses to take over his father's company, and seemingly harbors resentment towards his father's apparent "thirst for women" (although some in-story dialogue suggests there may be some as-yet unrevealed reason for that) (2) FMC is both the Company's Head Secretary and (IMHO) most definitely a "Sexy Onee-San", who has apparently been directed by MC's father to "make a man out of him", and she starts that process via liberal application of "T", "A" and "P", plus some (as mentioned in-story) "unmentionable things".
Bottom line is: MC was given "an offer he couldn't refuse", proving that Rino-san's "approach" was ... wait for it, ..... "SUPER-EFFECTIVE"!
In The End, and seeing that this is the first chapter of a harem-themed series, There Can Be Only One Decision:
"LET'S GET READY TO RUMBLEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!!!!"
Me: \o/
Also me: It†˜s even a series! Don’t forget to praise the Goddess of Sequels \o/\o/