Gogogogo-Go-Ghost!, Vol. 1 (manga)

After an illicit affair at work falls through, office worker Ushiro Akechi is wallowing in quiet desperation and stumbling towards ending it all. What she really needs is an older sister to talk her back from the edge… Luckily, she about to meet one—from the other side! Self-proclaimed Guardian Spiritual Older Sister Masako is ready and waiting to take Ushiro under her ghostly wing! Can they together turn a brush with the end into the start of a gloriously funny new partnership!?