"It ain't about how hard you can hit, it's about how hard you can get hit and keep moving forward," -Rocky, from the movie Rocky Balboa

“Fight one more round. When your feet are so tired that you have to shuffle back to the centre of the ring, fight one more round. When your arms are so tired that you can hardly lift your hands to come on guard, fight one more round. When your nose is bleeding and your eyes are black and you are so tired you wish your opponent would crack you one on the jaw and put you to sleep, fight one more round – remembering that the man who always fights one more round is never whipped.”  -James Corbett, World Heavyweight Boxing Champion from September 7, 1892 to March 17, 1897

In the Vietnam War, combat medics had a tragically low life expectancy during firefights, often estimated to be just 6 seconds. This was due to their role as front-line rescuers, making them prime targets for the enemy, according to Hero's Bridge. https://herosbridge.org/heros-bridge-honors-combat-medic-on-5k-medal/

This priority targeting is even true in things as innocent and safe as multiplayer video games.  In pvp video games, any team failing to target the healers first is literally asking to lose.  

This gets absolutely brutal in high level competitions.  There is a good reason why so many players refuse to play support.

This is such a vital part of online multiplayer player versus player battles that there have been literal mods made to automatically target healers for priority killing in games.   Here's one example that decimated the number people in WOW willing to play Healers in pvp enough that the original author of "All Healers Must Die" had feelings about it and renamed "Healers Have To Die" while adding protector functions: https://www.curseforge.com/wow/addons/h-h-t-d

As pvp support, you have the power to clutch games, even in pick up groups.   The price is being the priority target for the enemy. 

So, back to the anime, to be clear, this is not the story of a typical main character.   This is the story of an underrated support character.

If pvp healers ever wanted an anime made of them, this is it.   That’s right down to the pure nastiness of the job in high levels of competition.

Three heroes from earth are summoned in a common Isekai troupe.   Two obviously test for hero status, they were the student president, Suzune Inukami, and student vice president, Kazuki Ryusen, of their high school.

Both would be the typical leads for any story, being exceptionally talented, intelligent, and powerful people.  They are literally the people that anime's fawn over constantly.

Both are given the typical hero's treatment.  Kazuki Ryusen even becomes the love interest of the local princess.

This is not their story.   I assume this gave a cliche wielding executive in some publishing or anime company an ulcer from the sheer shock.

The third student is Ken Usato.  His magic test confirms he is a rare magic healer, rather than a hero.  This is something that sends the people who summoned him into a sympathy panic on his behalf.

I'll simply say a competitive pvp guild leader, Rose, comes in and involuntarily drags him off to the story.   This is not an exaggeration.

You may now que the training montage.   It is brutal.

This is in great contrast to the two heroes pretty much living the easy life in the castle.  Ken Usato goes through literal hell.  

This is his story.  This is also the story of other crazy bastards that do the unsung job of rescue, under enemy fire in combat.

Other than that, I’ll give no spoilers.   It gets the thumbs up of a support pvp vet from several games.   

Ladies and Gentlemen, I'd like to welcome you to what the armed forces calls "the suck".  Again, if you ever wanted an anime about what it is like to be a competitive pvp healer, this is it. 

You can't have diamonds without pressure.   You have to adapt and overcome.

https://en.wikipedia.org/wiki/The_Wrong_Way_to_Use_Healing_Magic