Wise Man's Grandchild

Wise Man's Grandchild is a light novel series that received an anime adaptation which aired in 2019.

The story follows a young Japanese salaryman who dies in an accident and finds himself reborn in another world with his memories intact. Found by the hero Merlin Wolford, he is given the name Shin and is adopted and raised by him as his grandson. As the years pass, Shin demonstrates unparalleled talent in both magical and combat skills but when he turns 15, it's apparent that Shin has a lack of common sense and a lot of social awkwardness. To help him mature and hone his skill alongside other teenagers, he enrolls in his kingdom's Magic Academy on recommendation of the king, making new friends and learning more about the world.

A video game adaptation of the series, titled Wise Man's Grandchild ~Legend of Ultimate Magicians~ was released in 2020.

OP
Shin's clothes rip off.

Episode 7
The guys are at an indoor bath.

Episode 8
Elizabeth has the wrong idea about Shin and August's close friendship, and later everyone is at the beach to train.