Translates as "Summer Storm" is the story of swords and souls eternally retold... wait that's Soul Calibur. It centres around a coffee shop (Ark) and the employees but here's the kicker, two of them are time travelling ghosts (Arashi & Kaja), although they're ghosts they still have a physical form. Sounds a bit kooky and not sure if it's explained as to why they're there or can time travel but the story is they were killed in an air raid during WW2. For them to time travel they need to form a "connection" with a special person, Arashi forms a connection with a 13yr old boy (main character) called Hajime who's rather brash. Kaja says she can only form a connection with a girl, and much to her surprise she accidentally forms a connection with a boy called Jun. Who'd have thought the character who looks and sounds like a girl is actually a girl, that has never been done before
So turns out that Jun has been dressing up as a boy (same age as Hajime) because she was wearing men's clothes due to being a model and first met the employees of Ark in said clothes and thus they all assumed she was a boy. She decides it'd be too troublesome to tell them otherwise and just tries to keep it a secret but obviously Kaja now knows and says she'll help Jun keep her secret.If it's not obvious this is a very funny anime, so if you don't like comedies you probably won't like this but if you love off the wall humour you should love this one. It's basically the funny adventures of the employees (plus a few others), which does involve time travel among other things.
Hajime's always telling Jun that "You're man..." and there's one episode where they somehow switch bodies leading to a lot of laughs. For some reason Hajime notices Jun has no balls but doesn't seem to notice the lack of penis
Plus any comment about her chest obviously doesn't go down well, he mentions how he (as Jun) has bigger breasts and starts groping "himself" so Jun immediately jumps him to stop him from groping her body, he thinks she's offended by the remark so says she's completely flat and thus gets more of a beating 
One episode the master (Sayaka, also con artist) notices the milk has gone off so she tells them to travel back in time to when the milk wasn't off. Kaja tries to explain to them that it doesn't work that way but they're too dense to understand
There is a second season but no one really seemed to pick it up for fansubbing but I'm currently looking into that. Doesn't seem like it has been licensed yet either
