Mega Man Battle Network 4 - Blue Moon Blind Playthrough Part 63 : Ending & Review
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Mega Man Battle Network 4 is a 2004 tactical role-playing game developed by Capcom for the Game Boy Advance (GBA) handheld game console. It is the fourth game in the Mega Man Battle Network series. The European version featured a completely different logo, which was also used on other Mega Man titles. Like Battle Network 3 before it, Battle Network 4 has two different versions, Red Sun and Blue Moon, that differ in story and gameplay details. Battle Network 4 is compatible with the e-Reader, and can be linked up with Rockman EXE 4.5 Real Operation and the Battle Chip Gate for NetBattles. It is able to link with Mega Man Zero 3, and contains references to Konami's Boktai series.
At a space research center known as NAXA, scientists discover a massive asteroid speeding toward the Earth that would cause the extinction of all life. After a call is put out to the world's greatest scientists, including father of the main protagonists Yuichiro Hikari and a man known as Dr. Regal, they decide to direct the asteroid off-course with a laser. When that plan fails, Regal suggests searching for a world-class Net Operator and NetNavi.
Meanwhile, main protagonists Lan Hikari and MegaMan.EXE experience trouble both in and around their hometown of ACDC and on the Net. After fighting ShadeMan.EXE, he drops unknown data which is later revealed to be a DarkChip, a program described as unleashing great power at the cost of a Navi's "soul." The duo are warned to never use it under any circumstances.
With no leads to go on, the duo decide to participate in the local Den Battle Tournament. After becoming the champions, they return home to find it burglarized by someone connected to the DarkChip. Upon investigation, they discover that the DarkChip Syndicate Nebula was behind the attack of their home, looking for the DarkChip in their possession. The pair again fight ShadeMan and decide that they have no other option to defeat him than to use the DarkChip. After entering and becoming champions of the Eagle or Hawk Tournament (depending on the game version), Lan and MegaMan encounter LaserMan.EXE, another Nebula Navi, who shows MegaMan the DarkSoul within him as a result of using the DarkChip.
Following Regal's suggestion to search for a world class Operator and Navi, Lan and MegaMan are invited to the Red Sun/Blue Moon Tournament in the country of Netopia. After winning the tourney, the duo travel to NAXA and are briefed on the situation and learn that the asteroid headed for Earth has a computer in it and can be steered away with a Navi. Regal then reveals himself as the leader of Nebula and announces that the asteroid was a part of his plan all along. In the asteroid computer, MegaMan again fights LaserMan (now revealed as Regal's Navi), as well as Duo.EXE, the operating system of the asteroid who is thinks Earth is "evil" and must be cleansed. MegaMan defeats both of them and convinces Duo that the planet is worthy of avoiding destruction. Duo and the asteroid leave and Regal jumps off of the NAXA tower to avoid prosecution.

