Good start. However, this is an isekai so I'll wait a bit before I consider giving this any praise given that isekai always turn into a let-down no matter how good they start.
i've said it before when this manga was announced on r/manga but this is literally my writing prompt from like a year ago https://www.reddit.com/r/WritingPrompts/comments/8irskr/wp_you_are_the_manliest_man_you_know_you_are/
Only one chapter translated now but this is seinen and the reincarnator was basically a gramps.
I hope this does deliver and will be different from the usual edgy harem isekai beta MCs that are flooding the market in the recent years.
Should be good as long as it won't suffer from bad writing by the MC not acting his or rather her mental age and make decisions with pre-teen mentality.