Roland is an assassin who, one day, breaks from his team and single-handedly “kills” the demon king.... more>>

After returning to the kingdom, the king graciously promises Roland whatever he wants for his heroics. Conflicted in his desires - he hasn’t thought of anything outside of killing for years - he remembers that one of his teammates told him what she plans to do after evil is defeated: "Live an ordinary life."

And so Roland, with his ability to become unnoticeable and the disguised demon king/queen Laila at his side, decides to live a slow life. <<less

When he was young, he had failed at the Magic Academy and was looked down by others.... more>>

However by chance, he discovered a mythological medicine, so he obtained an immortal body.

In order to get revenge on the people who made fun of him, he began researching magic and magical artifacts different from the academy. After 5000 years of research, he has become an ancient magic user before he noticed.　

The people he was seeking revenge were long gone, losing his purpose, Asley went on a journey to see the world after 5000 years with his familiar Pochi.

With an unexpected turn of events after helping many humans, he is now living at the magic academy.

A 5000 year old man with a young appearance Asley, how will he live his second life’s youth?

- Based on a Novel

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Interpretations of Kakifly's K-ON! 4koma by various other mangaka.