Moegaku (もえがく) is a series of English language study adventure games for PC and PSP developed by Studio Sagittarius. Based on the concept that was made popular by the Moetan series of English wordbooks, it tries to spark the interest of the player for language-learning with cute, moe characters and a setting that should feel familiar to otaku.

Enhanced version of the game included idiom card, audio CD, metal charm pen.

In January 2008, it was adapted into the television show Moegaku★5. It aired on BS Fuji Monday-Friday, and was hosted by voice actress Aya Hirano.

One day, Kyoka Akira told Tukishima Moe he would study in United States. Although Moe wanted Akira to stay, Moe had poor English skills. Responding to Moe's wish Lulue appeared to help Moe. Using the transformation item given by Megamisama, she must battle against rival magical girls, by chanting in English to cast spells. Unfortunately, Moe's English was poor. However, Emily was willing to train Moe with English. In order for Moe and Akira to study together, Moe must prepare for the final battle taking place 50 days later.

The game uses branched story in the adventure mode. Everyday Moe was taught how to cast spell using English chants. In every 10 days, a quiz appears. The success of English tests affect the endings.

It is a PSP port of the original video game.

It is the enhanced version of the 2005 PC game. New features include:

Japan Sofmap order came with telephone card.