The plot of Isshuukan Friends is about a young boy (Hase) who is in love with a beautiful but strange girl (Kaori). Kaori has a condition in which on a weekly biases the memory of her friends are erased. This means that the plot is about Hase, trying to befriend Kaori and is required to introduce himself to her every week on Monday just to keep up their friendship and ultimately for her to remember him for more than just a week. This unfortunately gives the anime a very frustrating and repetitive story.
Art
It somewhat improves the boring and bland nature of this anime
Sound
Its fine but theirs nothing really that memorable
Characters
First off i would say Kaori a better character than Hase (not a compliment), as if anything she is able to get some development unlike the other characters because of her condition and for the sake of the plot she needed some development for there to even be a story. However even with the development she never really does anything much apart from making the main male character confront her every week and writing a diary.
Hase is a forgettable and weak male lead (maybe thats the real reason Kaori couldn't remember him) as he just relies on Kiryuu who just offers him advice to move the plot forward.I believe Kiryuu would have probably been a more interesting main character.
My overall opinion
I unfortunately couldn't stand one week friends having the two main characters relationship build in every episode to then just take a step back became soooooo tiresome after like the third time of the main female character (who was just forgetable) forgetting the main male character. After dragging myself through every episode just to see how it ended i was just left frustrated and disappointed, i may as well have just watched the first episode and stopped because that in the end is where the anime leaves you, after finishing the final episode you just get looped strait back to episode 1. In my opinion i wouldn't recommend this anime as putting my hate aside the story is incomplete so instead of wasting your time watching one week friends find a good romance anime that actually has a conclusion e.g. Your lie in April, Toradora! or Kokoro Connect
