Update:
Looks like Arunaru is translating Mamatoto. Mamatoto is the original game on which Mamanyonyo was based on, which then got a widescreen all-ages remake named Widenyo. Here's some evidence on Arunaru messing with Mamatoto.
Last October 1, 2014, Arunaru had a poll in which two games were made as choices. The question was which game would /haniho/ want to see translated? The choices were Atlach-Nacha or Mamatoto. Arunaru clearly stated that he wouldn't necessarily translate the one having more votes. Although Atlach-Nacha did win by a small margin, Arunaru still went and started translating Mamatoto. This might not be an official project yet. Therefore, I'm stalling the putting of Mamatoto onto the progress post on the first page until Arunaru verifies that he'll finish it until the end or if he posts translation progress at least once.
Let's pray to the translating gods, fuwans!
For more info on the game, look here.