While a real autosave (either time-based or number of line based) might be difficult, it should be pretty easy to force a save to a particular slot (a non-user saveable slot) during/after every eyecatch (when the umi logo appears and the glass crack effect is shown).
While a real autosave (either time-based or number of line based) might be difficult, it should be pretty easy to force a save to a particular slot (a non-user saveable slot) during/after every eyecatch (when the umi logo appears and the glass crack effect is shown).