Determined to pursue his glorious childhood dreams, 30-year-old Rick Gladiatol, a modest clerk in the adventurers' guild, is offered a once-in-a-lifetime opportunity after he fatefully encounters the dark elf Reanette Elfelt. Reanette happens to be an elite adventurer of the legendary party Orichalcum Fist, whose members welcome Rick under the condition that he follow a Spartan training. Two years later, Rick is finally ready to take the E-Rank exam officially qualifying him as an adventurer. However, raw magical power can only be developed until one turns 20. As such, Rick faces the general hostility of fellow participants and examiners alike, leaving him no choice but to show the world that his hellish training has turned him into an invincible warrior.

It's the end of June, and the summer seems to be locked in place. Tomohiro Izumi, recognized by himself and those around him as an introvert, is spending another quiet day in his little corner of his classroom... or so he thought. "Congratulations! You've been selected as our next student council president!" The student council president lottery, held on the spur of the moment by the academy. Tomohiro manages to be the one randomly selected thanks to his ridiculous luck! Now the spotlight is suddenly upon him, and as a result, rumors about him begin to circulate. With no way out, Tomohiro relies on his advisor to start gathering allies he can rely on. But none of the candidates his advisor suggests, from his classmate Kano to his underclassman Asumi, and even his little sister Hiyori, are even coming to the campus!? Amidst all of this chaos, even the former president that no one could ever get ahold of, Shio, shows up...! Is it fate, or is it a foregone conclusion? The unheard of and unprecedented battles of the "Random Lottery Student Council President" are about to begin!

Afraid that his life may end at any moment, Otto Suwen begins writing a diary documenting all of his experiences. Now part of Subaru Natsuki's eccentric band of colorful characters, the apprehensive merchant is certain that new dangers lie ahead in their mission at Sanctuary. But amid the rising tensions, there are still moments of respite and reflection, ripe with opportunities to make vivid memories.