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I am wondering why this series is not listed as a harem series.
the main has 3 girls in love with him (one being a sister)
2 have confessed / want to marry him
what else will it take add the harem tag?

Sagiri Izumi (和泉紗霧 Izumi Sagiri)
Voiced by: Akane Fujita has indicated that she has strong feelings for her no blood related brother.

Elf Yamada (山田エルフ Yamada Erufu)
Voiced by: Minami Takahashi Elf is a 14-year-old popular light novel author who has sold over 2 million copies. She starts living next door to Masamune and is famed for dressing in a Lolita style. She has shown to have developed romantic feelings for Masamune and has confessed to him. Elf Yamada is her pen name. Her real name is Emily Granger (エミリー・グレンジャー Emirī Gurenjā).

Muramasa Senju (千寿ムラマサ Senju Muramasa)
Voiced by: Saori Ōnishi Muramasa is a successful light novel writer who has sold over 14.5 million copies of her novel series. She is a fan of Masamune's "Silverwolf of Reincarnation" series, So she gets upset after he ends series. She tried to stop him from writing romantic comedy series but admitted defeat after losing to him in Tenkaichi-Budoukai competition. She is in love with Masamune, but he rejects her after she confesses her feelings to him. Muramasa Senju is her pen name. Her real name is Hana Umezono (梅園花 Umezono Hana).