High school student, the Assistant, is made to attend a club due to club regulations. While looking for a potential club, he comes upon one dedicated to stage magic where he then meets Sempai who unfortunately has crippling stage fright that causes her to mess up the performance continuously. Then to add onto that, you have a street performer going by the name "Saki-chan" who tried to usurp the magic club, and she also has some...interests in her brother. Yeah, it's that kind of anime.
There's nothing much to the show. As an ecchi, the main jokes revolve around Sempai finding herself in compromising positions such as getting tied up; having her clothes get damaged; or in one instance, forgetting to bring clothes to dress into as part of one of her street performances. That kind of humor gets really old because of how predicatble it can be. Going onto animation, it's average. Honestly because of the many pantyshots and boob bouncing, it almost becomes bland as it happens in nearly every episode.
The opening and ending themes are decent as is the voice acting. There is a small number of characters in the series with each varying in terms of how they are played. The Assistant is generic and mostly serves as the stand-in for the audience observing Sempai's misadventures. He is the straight man of the relationship, but at the same time, I found myself slightly disliking him because of the fact that he makes it clear often that he is largely interested in Sempai for her breasts and her other attributes. The sixth episode in particular has him take advantage of hypnotism to get Sempai to do whatever he wanted. A really shallow guy that is.
Sempai is funny with her stage fright, but this also tends to get in the way. She is greatly passionate about magic, which isn't bad...but whenever she tries to recruit new members to the club, she comes off as annoying. Especially because there is no sign of her getting over her stage fright. It is something that continually gets in the way of progress. I understand that's a part of the joke -- she performs better when she isn't in front of anyone else -- but it quickly stops being funny quickly.
Saki is a big-breasted gyaru girl who does street performances. From the looks of it, she seems that she'll be set up as a rival of Sempai's. There's nothing to her aside from the fact that she has a disturbing crush on her obese little brother. Just her practically foaming from the mouth when thinking about her brother is unsettling. Then there is Sempai's older sister...Sister....who is an airhead who loves to tease her little sister and offers to be the Magic Club's advisor (she's mdoerately a good character), and Madara who is the club president of the Chemistry Club who takes a disliking for Sempai to the point that she loathed having the scientific tricks she does be equated to the stage magic that Sempai does. For the most part, all the characters are defined by one trait no more, no less.
Overall, Magical Sempai is a slightly below average series that if you love ecchi humor, I'm positive you'll have a good time with this one. Each episode is comprised of small segments that run for 12 minutes, so it's not too much of a burden to watch. But know that you are getting exactly what you'd expect.