Reiji was happily greeted by his beloved imouto Erika who had bright blonde hair and cat ears. Yes, even though he is 100% male, he is also her older sister. Her cat ears are also very much real and can appear and disappear on a whim. It became like this due to a little complicated reason, but he accepted it without changing his ways. However, this should not be normal – she should be calling him ‘onii-chan’ and she shouldn’t have cat ears. He thought that if he would be able to do something about his own problems, then she would be also be freed from her current state.
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