 If you liked
IS: Otoko demo Onna demo Nai Sei
|
 ...then you might like
Rutta to Kodama
|
This is a one way recommendation, first of all.
If you like the romance of the main pairing in IS, you should definitely check out Rutta to Kodama because they are extremely similar. Both relationships rely on trust and leaning on each others strengths. They're less sexual and more spiritual and romantic. Both of the submissive characters are similar to one another as well and look the same.