I can't remember the title of a manga I was reading and I'd appreciate some help finding it.

A powerful wizard transmigrate his soul into an alternative self who is a powerful warrior. The alternative self has an adopted sister he's in love with. She's being forced to marry the local lord's son. The alternative self uses the magical knowledge of the wizard to save the kingdom's poisoned princess and gets rewarded. He then saves his sister and uses his reward to stop her from marrying the lord's son.

Almadianos Eiyuuden

~4400 manga completed
~1700 ongoing...