 If you liked
Oda Nobuna no Yabou
|
 ...then you might like
Isekai wa Smartphone to Tomo ni.
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- The main characters both get sent off to different universes, but retain something from their homeland that gives them an upper hand over the natives.
- Many young girls in both cases
- Both contain fanservice, but not the typical ecchi lewd type
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Recommended by captainmorgan
The basic premise between both series is that both MCs are thrust upon a world different from their own, and they (atleast in the beginning) posses the smartphone which they use against opponents they face.
Also a good note, in Oda Nobuna's Ambition the MC amasses quite the harem despite slowly falling in love.