delete most recent update, then reinstall [loading save data shouldn't be a problem, but create a dump file just incase]
If you dont wanna play from beginning You should move your file data save(android>nijukozo.com) move it to everywhere(to picture,or etch) and uninstall older version and install new version..but old version save data can't use for this new version..bcs dev add messenger fiture..so sadly you should play from beginning like me..