In this second paired game in the Keitai Denjū Telefang series, a new T-Fanger named Kyou becomes involved in a struggle against the evil Denjū named Diablos, who wants to permanently cut off humanity's access to the Denjū world. Now that Diablos has killed all but one of the antenna trees, it's up to Kyou to stop him before the two worlds are completely separated, which would leave Kyou stuck in the Denjū world forever. Gameplay is similar to the original pair of Telefang games, but with some added enhancements. Several new Denjū are available, and many old ones now have different evolution methods. Attacks now receive their own typing independent of the Denjū, meaning a monster with the right move can cover its own weaknesses in battle. New types of items are also introduced, including healing items and ones that increase the chance of a defeated Denjū sharing its phone number with Kyou. Lastly, befriended Denjū have their own friends, which may randomly appear to assist in battle even if Kyou has never met them before. As with the earlier games in the series, Speed Version was released as part of a pair, with Power Version being its counterpart. Certain Denjū are exclusive to one version or the other, and players can connect their games via Game Link Cable in order to trade and battle their collected Denjū.

File list:
/Keitai Denjuu Telefang 2 - Speed (Japan)/Keitai Denjuu Telefang 2 - Speed (Japan).zip