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The Testament of Sister New Devil

The Testament of Sister New Devil

Finished

新妹魔王の契約者(テスタメント)

High school student Toujo Basara is thrown into turmoil when his eccentric father announces he is remarrying and then leaves the country, leaving Basara to live with his two new stepsisters, Mio and Maria. The situation becomes even stranger when he discovers that Mio is a newly crowned demon lord and Maria is a succubus.

Basara is nearly forced into a master-servant contract with Mio, but the ritual goes wrong and a reverse contract is formed instead, making him the master. Now bound to his demonic stepsisters, he must deal with their seductive advances while protecting Mio from rival demon tribes and hero factions that want her dead.

Caught between dangerous enemies and increasingly intimate situations, Basara has to learn fast how to wield his new power and keep his unusual family safe.

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