"Su" along with other similar sounds, is abbreviated in speech often from what I've heard (not an expert by far in JP language but I've heard plenty of casual talk out in Cali etc). Dess, "staato (start)" etc

If I recall, Wilan speaks Italian, which is the same as my situation. I speak Spanish, so the same goes: what we hear is mostly what we write. Of course there are several exceptions (such as writing "gu" to make a hard g sound, but "gü" means you pronounce both hard g and the u). English, by far, has the most complicated grammar and rule exceptions >.>

No language is immune to rule exceptions though, even if, like Italian or Spanish or Japanese, most of the spellings are phonetic.