I struck gold with this one.

Katase Shiori is a short well endowed office lady who just received her first kohai in the nervous yet kind Takuma Shinozaki, what starts as a working relationship, starts becoming something more as the two slowly fall in love with each other, everyone can see it from friends, family to other co-workers and especially the boss.
It's a role reversal of the other office anime "My Senpai is Annoying" but Tiny Senpai doesn't pull the same cliches Annoying Senpai did, although the downside of Tiny Senpai is that despite the awkward situations the two leads often find themselves in, they take things too slow to the point where the anime is done before any satisfying outcome happens, it helps that the cast is too wholesome to really hate anyone, so you still like what you see.
Not seen the dub but I doubt it would have the same impact as the sub does.
Anime are trying everything to sell the idea of comfortable relationships in the adult world to save the declining birth rate that the teenage characters that dominate much of anime are on the decline, replaced by adults that need love in their lives, Tiny Senpai is too inoffensive to really achieve that but on it's own merits it acts as a safe watch for anyone intimidated by the working world.
Final Verdict: Way too wholesome to deliver it's mission statement but is pleasant enough slice of life to function with other shows of it's type.