Kami-sama no Memochou - Volume 3, Chapter 6

Jerry traversed across worlds and arrived in a Beast Summoning era. In this world, everyone could summon their own pets. Darkness was looming, and the world was in turmoil. Relying on the power of their summons, many shrines plundered the resources at every corner of the world like tyrants. But when everyone else was summoning adorable pets that could help them in battle, Jerry discovered that his summoned pets were a little different. Other people's pets are all kinds of beasts, but Jerry summoned gods from Greek mythology! King of the Gods, Zeus, “Master! I, Zeus, is at your command!” Athena, “I will fulfil all your requests, master!” Poseidon, “I will conquer this sea in the name of the master!” In constant summons, step after step, Jerry became the supreme ruler of this world!

When the zombie apocalypse hits, high schooler Mira teams up with her snarky best friend Elliot and the mysterious, crowbar-wielding Alex. Armed with nothing but a broom (yes, a broom), Mira leads the ragtag crew through a zombie-infested town. Soon, their biggest battles aren’t just against the undead—they're against hunger, exhaustion, and the question of why they're even fighting in the first place.Rom-Com Zombie Apocalypse is a wild, funny, and a bit existential tale of friendship, survival, and finding meaning in a world gone mad.

I got transmigrated into a game I’ve never seen before.

I thought it was a top-notch RPG and spent 30 years on it.

I retired as a war hero and planned to spend my remaining time leisurely.

But it turns out, it was an academy story?