Old Man is Summoned

The old man who has been summoned

Old Man Travels

Old man travelling

Old man teaches

Old Man Teaches

Old man makes a visit

BONUS CHAPTER OLD MAN IS ABSENT

Wandering Old Man

Old Man's business talk

Old man and the lost child

Old Man and the Child

Old man the Godparent

Special arc the absent grampa

Old man and the training field

Old Man and his traveling companions

Old Man and the Goblins

The Town by the Lake with the Old Man

Oldman and a Food Stall

Jii-sama and the Underground Giant

Grandpa and the Animals

Old man and the Lizardmen

Oldman and the Tea Party

Oldman and the Lord of the Lake

Grandpa and the Drops of the World

Oldman and the Outside World

Jii-sama and the Blender

Grandpa and the Great Ogre

Grandpa and the Great Labyrinth

Grandpa, the Boy, and the Bear

Grandpa, the Bear Cub, and the Treasure Chest

The Old Man, the Boy, and the Father

While protecting his grandson from a burglar, Seitaro Asao, a tea plantation owner, gets stabbed to death. A slight mix-up by a goddess gets him, instead of his grandson, accidentally summoned to another world. Seitaro accepts to take his grandson's place and starts his new life in the new world as a man ten years younger. Things are quite eventful from the start, but the gods work in mysterious ways, and wisdom and protection from the goddess helps him overcome all obstacles.
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(Source: Alpha Manga)