 If you liked
Gate: Jieitai Kanochi nite, Kaku Tatakaeri
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 ...then you might like
Yao Jing Zhong Zhi Shou Ce
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Similarities
- Both MCs are isekai into a fantasy world
- Both MCs are otaku, social outcasts
- Both MCs meet many women on their journey
- Both MCs have no cultivation/magic powers (apart from GATE MC military training)
Differences
- GATE MC is tasked with teaching the other world about otaku culture VS Spirit Seed Manual MC tries to collect fairies and become stronger
- GATE is backed by the JSDF VS Spirit Seed Manual is backed up by nobody except his alter-ego
- GATE has a 2-way isekai portal between worlds VS Spirit Seed Manual just teleports MC into the new world