Saioshi no Gikei wo Mederu Tame, Nagaikishimasu!

I'll Live a Long Life to Dote on My Favorite Stepbrother!

The story of Saioshi no Gikei wo Mederu Tame, Nagaikishimasu! follows the struggle of a player to protect his favorite character, who gets reincarnated as his older brother-in-law in a simulation raising game - however, the player is reincarnated as the younger brother who was meant to die.
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(Source: Anime News Network)