@Chizan : Except that this would not be such a template since reincarnation into the future is not isekai.
Isekai is a Japanese subset of portal fantasy, it is just portal fantasy with a couple extra common tropes meant to cater to a Japanese audience, it is common because in a world with radically different culture and quirks then their own it a) makes it easier for them it identify with the protagonist if he is Japanese (being from a Japanese like culture is not enough, there is a reason the vast majority of novels in the world have a main character who is form the ethnic group of the intended reader just look at how many US written novels have a white male for the lead character) and b) allows the character to act more in line with their values and customs.
Reincarnation into the same world is not a part of portal fantasy.
That said isekai by its nature, like many genres, has a limited number of ways it can start. Westerns, Detective novels, well really every genre of fiction all have so many skeleton formulas that most works use one of and flesh out, it is just that in isekai there are more immature trolls who keep pointing out those similarities at the start in an attempt to show off their "greatness", instead of comparing the entire work like a mature reader.
What is important for the story, and its originality, is how it develops form the starting point. Take a look at Fairy Tail, there the first 9 chapters are just the 2 primary characters getting to know each other, and it is not till chapter 10 that the core team is assembled and you start seeinf what the series is about. If you took it by its first chapter, like you are doing here, it does look very formulaic, because it is still in introducing the characters and the world. and that is a series that was not meant to go that long (IIRC originally supposed to end at the Phantom Lord arc), where as this is adapted (likely through a LN) from a webnovel that has over 170 chapters. Same with Naruto the first few chapters are very formulaic if you actually look into them.
Mahou Sensei Negima is an very good example of how you can not properly judge a series from its first few chapters, since the author was kind of type cast and in order to get the series published needed to sell it as a different genre and slowly morph it into what he wanted, the first few chapters look very different form the stuff half way through the series, .