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Makai Kaeri no Rettou Nouryokusha
Inferior Psychic Underworld Returnee ; 魔界帰りの劣等能力者
Doumori Hiroto is a mysterious boy from a lineage of ancient spiritualist who have been guarding the pathway to the underworld for a thousand years.But he was born with a defect caused by bloodline of magicians mixed into his ancestry.He possessed both spirit and magic power instead of either, yet he was able to use neither.For this reason, his grandpa took him to his friend, a chinese sage, to have Hiroto being taught the sage cultivation.He quickly mastered the sage path and was said equal to a hundred years cultivator.Somehow, thanks to his sage power he became able to wield his original spirit and magic power.However, during an incident where he had to unleash his full power, the recoil of that power caused his existence to be erased from everyone's memory.
Author: Tasurou // Artist: Torikai Yasuyuki // Year 2020
It's short, and that works in It's favor. The premise is the generic story of a boy who returns to school/academy and is actually really strong because a dark past. It plays it it straight, ot has no room to be overly complicated or to be annoying, and it actually has the perk of the MC not being afraid to show he's strong (unlike other stories where they hide it with no real reason except to let the plot happen in a school environment), while also hiding his trump card (because reasons, it has weight since it's a valid reason and the MC is not afraid to show his power as I said, it's due to the consequences of said ability). If you like stories with a premise like that, you'll like this one, and it has a somewhat conclusive ending, so more points in favor.