So at first it seems like a decent premise: the MC is a returner, and is at a school for them. One of my favorite nostalgic stories is Hagure Yuusha no Aesthetica, with a wild MC who is a returner, and goes to a school of them. The MC is being followed by the demon lord (hot female one) from his isekai world. However, there are tons of flags immediately thrown out. For one, students are forced to go there, and yet somehow someone has the power to do so? For all that they're OP heroes, they're remarkably docile. So yeah, plot armor is kicking in.

Then it turns out the MC spent THIRTY THOUSAND years there, and is OP as hell... yet somehow the two of them never got over their virginity? And I do mean virginity, of the super blushing shy boi type, can't stand to see a naked female. Oh, and he refuses alchohol because he's a minor. A 30,015~ year old minor, riiiiiight. Also he's the super pathetic can't interact with people type, because supposedly being in a realm with one other person means he loses his ability to communicate with others? Oh, and he's selfconscious and has no confidence. Nor ability to judge other peoples power levels, despite literally spending 30k years training. And i don't mean he was trapped there for a long time after he finished training, no, he spent ALL 30k years training.

SO frankly the MC is a combination of all the worst traits that somehow appear in the shittiest of Japanese trope filled stories, but without a logical reason for them, and ALL the reasons for them not to happen. This is the type of story that relies on the MC being dense AND dumb, but the spectators have to be even worse in every metric for the story to function.

Avoid. AVOID.

There's a lot to like with this story, from the world building to the art and the characters. The main character actually tries to keep under the radar unlike every other manga where the main character says they want to keep a low profile and then do the equivalent of shouting "I'm special!" in the streets and making sure everyone knows. It's refreshing.

With that said, the facial expressions of the main character often make no sense considering his background of living a d training for 30000 years. Either he's pretending to be surprised but no one, not even the reader, knows this, or he's learned nothing from 30000 years of training.

Now, that only happens in combat situations where the main character isn't in combat, so it's a relatively minor thing, but it is irksome.

But I think the biggest drawback, by far, is how each chapter is a weekly release worth of story inside of a monthly release manga. Not enough gets resolved per chapter to justify having such a slow release schedule.

But, if by some miracle this manga doesn't get axed, in 5-10 years it'll probably be a great story.

The MC is way too passive, and incompetent (I mean if you're paired up with the worst team you obviously have to put some effort, not just stay there eating chips … the minimum is not letting your teammate that's always by your side destroy everything she touches…). He should be a bit crazier after having lived 30000 years and obviously not stay low profile after he's been discovered.

All in all the story and plot so far are fine, but since half the panels are taken by the supporting cast which is terrible I'l drop it here. It looks like there will be some action in the next chapter (ch 9) but since it's a monthly series even if the plot gets better it might be axed. The series is based on an ongoing unlicensed novel with only 4 volumes so without references it's hard to tell anything outside it's weak start.