Boku o Tsutsumu Tsuki no Hikari - Boku Tama Jisedai-hen

Life's hard when you're shy, harder still when you move from your quiet hometown to the bustle of a big city and a new high school. Poor Alice also has to cope with being regularly harassed by the bratty neighbor boy, Rin. Her life turns upside-down when she's stuck babysitting Rin and the annoying chore ends in unexpected tragedy. What Alice doesn't realize is there could be a greater force at work than unhappy chance!

(Source: VIZ Media)

Four years have passed since Boku wo Tsutsumu Tsuki no Hikari. Ren has grown up and is now in 6th class of elementary school. While he is coping with emotional issues over being a Kiches, brooding over his one sided love and not being able to see his "Guardian Angels" anymore as the only one in his family, a mysterious girl appears before him and later in dreams before Rin and the other reincarnations from the Moonbase, trying to get their Moonbase passwords...