Boku wo Tsutsumu Tsuki no Hikari: BokuTama Jisedai-hen

Rin and Arisu live peaceful lives after the original series ends. Their son, Ren, is an ordinary boy until a man and a woman, described as angelically beautiful, appear and inform him of a newfound power. The nature of this power remains unclear. This is the long-awaited follow-up to "Please Save My Earth."