Sister Rescue Plan

Reborn as Miku Izayoi's younger brother, Izayoi faces immense pressure in the future, as there are always people trying to sleep with his sister.
To protect his adorable older sister, he started spending money to become stronger.
(Five battles (completed) - Duel (temporarily departed) - Round Face (completed) - Bouncing Bouncing Bouncing (completed) - Blue Ribbon (completed) - Godslayer (ing))