EDIT: By now the entire app has been translated, including subs for all the things the charaters say, so this guide has become obsolete. I'll keep it on the site as a sort of awkward review though (^-^)
When you open the app you are greeted by the above screen. Slide the screen left or right to switch between the characters. I will use Kakeru for the rest of this explanation. Tap anywhere on the screen to go to talk mode:
And this is what Soine mode looks like. Like before, the left button is for making Kakeru speak and the right one takes you back to talk mode.
The third option lets you choose whether you want the voice for the alarm on or off (why would you want to switch that off? xD) and the fourth option lets you choose which voice you want. For the time being both Kakeru and Jin have two options.
The fifth option allows you to set whether the alarm will go into snooze mode, with the sixth option allowing you to choose after how many minutes it should repeat. But like I'll explain in a moment, these options are mostly useless for now. The final option is vibration on or off. I recommend off.
Now, as for why the snooze option is mostly useless: The alarm function doesn't work in sleep mode. Meaning that as soon as your screen switches off it no longer works, meaning that if you want it to work you need to set the setting of your iPhone so that it won't go into sleep mode, which drains you battery like mad. But I suppose it could work that way. Personally I really hope that they will fix this in a future update.
And this is what the wake up screen for the two of them looks like. I faint right after looking at it making the entire alarm option useless because I end up in coma, but hey. I don't own an iPad, but I bet they are deadly on that resolution (*o*)
ps: the reason why the screen says that the extra voices cost 1.59yen is because that is really supposed to euro's but for some reason it shows the yen sign xD
The third option in the main screen takes you to a list of all the sentences you boyfriend has said to you, and you can select them from the list to hear them. So far there are 60 lines for each character. I don't know whether you can get all 60 without buying the extra lines, someone let me know if someone gets more lines without buying the add ons :D
And finally, the fourth option takes you to the animate website, where you can buy the CDs xD
There, I think that was everything? If you have any more questions, feel free to ask!! (^-^)