Disclaimer: this is not spoiler, this is something that out from my mind, and from my heart for Overall, this anime is good after i watch the series, i surprised that this anine in ONA type (An original net animation) and not a TV type, but i really enjoy this anime and also, this anime help me on my essay, so many explanation about kind of a formula that used in thesis or essay. the anime explain each character background that make audience understand where the character traits come from finnaly, the anime gonna bring u enjoyment in every scene, and the story is easy to understand.