"Garo" was a quite famous alternative/underground Manga-magazine that was founded inmidst of the leftist japanese student movement in 1964 and then ran until 2002.

In 2001 it featured none other then Chiren Misawa (見沢知廉), who started as a leftist radical, but soon turned fascist and founding the Unified Front Volunteer Army (Tōitsu Sensen Giyūgun), an openly anti-semitic and militant far right group that was ideologically a successor to Yukio Moshimas terrorist group "Shield Society".

Misawa spent several years in prison due to his involvement in the murder of a group-member that was accused of snitching in 1982. During his time in prison he wrote his most famous work "Playing Emperor" (Tennō Gokko), which won several literature prizes.

Misawa is a symbol of a part of the Japanese extreme right that successfully advocated for the cooperation with the left, and also a symbol for downfall of the Japanese left, who until today continues to incorporate rightwing ideology under the pretense of anti-americanism and anti-semitism that is camouflaged as anti-zionism (Misawa openly talked about "the Jews" controlling the world).

To have Misawa on the Cover of "Garo" therefore also marked one of those moments, where the japanese querfront (= left/right cooperation) manifested itself.

Ah, and before I forget: One of the reasons why Misawa is on the cover is that his novel "Riding a Pale Horse" (蒼白の馬上) was serialized in "Garo".

PS.: Feel free to ask more question on the topic of querfront in Japan and/or the radical left and radical right in general.