God-like being attempts to break his curse with the aid of a human woman but ends up falling in love with her and wanting to stay alive/on earth.
Beautiful soundtracks and visually attractive drama.
Romance and bromance.
Bittersweet ending.

A cat in human form becomes a pet then a romantic interest to a human.
The tone is light with both funny and heartwarming moments.

Both focus on assassins, with a bond/romance between two of them, and have open endings. However Assassin Academy is much shorter and lighter.

Human in love with personification of death or destruction, hospital setting, melancholy feeling, focus on plants/growing things.