This is how you write a first chapter. So many authors focus on tropey trash over substance, how many first chaps have been written about how some dude found himself living with a bunch of girls? Or how he almost died and in order to save him they had to transform him and now he has to work for a secret organization? Or a visit from Truck-kun?
This has a great intro, great hook, good characterization, a twist, and some tears at the end.