magic school, seductive demon onee-san, annoying childhood friend. guess that's about it. oh, and magic battle story is ok. bit too generic but also has something in it that many could enjoy. light hearted comedy, sexy onee-chan, magic battle...sexy onee-san, and.. sexy onee-san pacing a bit fast. sometime it tried to have some interpersonal conflict in the serious moment but it always ended up in one chapter with little to none impact. it's not too heavy on the exposition which is a plus. also it does that thing that shounen love to use : turning the bad guy into the good guy, and potrayingthem in a better light after their arc end. which is fine, if it done well. the key word is "if"

characters is ok, except for the childhood friend. i know it's an popular trope, but damn she is annoying. talk about overused.

art is average. it's not bad, but it's not great either. it's easy in the eye, but that's about it i guess.

basically, if you like kind hearted mc, who are super shy and prude (the kind of guy that always shout "y-you only did that kinda thing with someone you like!!!" while blushing so hard, he become tomato)
and a sly onee-san who always tease him and try to get under his pant. combined with some magic battle (with a lot of talk no jutsu in them), then good news! this is for you, you're gonna enjoy it.