This must be the type of anime you can call: Cliches

The begin was quite a good start, trainee heroes, destined to fight the demon lord and POOF, the demon lord is dead

Now the hero works other job to support his own life but doesn't feels right because that's not what he wants, but when his friends ask, he just make that uncomfortable face like of he talks it out, he's gonna die

Etc, etc, the story now develops to how he has to take care of the demon lord's daughter and deal with her and work his job as the same time because that girl is a pain in the ass

And because she's the demon lord's daughter so she must have a great power that the other bad guys want to exploit and in the end, the hero will come and save her and bring her home and they live happily ever after

For the character:
Our main hero, who somehow have emotional issue because he can't become a hero who defeats the demon lord

The main girl, aka the demon lord's daughter, a kinda dumb girl who always make a fuss about everything, because every ecchi harem anime needs a dumb girl

The girl who is the mc's colleague, very kind and cute and has big boobs, because every ecchi harem anime needs a kind girl with big boobs

The manager, a very sly and witty character who somehow always know how to solves everything in her way, has big boobs, because every ecchi harem anime needs a sly girl with big boobs

The vice manager, who always complain about the mc, like the manager very much

The straight face girl who seems to doesn't give a shit about anything but actually is a very good person, we don't see this type of character much in ecchi harem anime

The former classmate who is a tsundere, always make a fuss about what the mc is doing, nice body, because every ecchi harem anime needs a tsundere