First of all, the ecchiness of this manga doesn't come from panty shots or huge boobs almost spilling out of clothes but it's straight up nudity so it's definitely nsfw. Nudity starts at the 2nd page when main character comes across a passed out, naked girl and continues throughout the manga, but it's never felt forced. The story is about relationships between adults, so naturally nudity comes up but to me it's much better than a some kind of forced cencorship to make the manga more approachable by wider viewers or obvious fan service to lure viewers. This manga excels at integrating nudity into the story and it's really hard to find mangas like that.

Art, story and main characters are outstanding. Unfortunately, supporting character's are a bit weak. Main characters' best friends start strong but they wane with everybody else as the story progresses. There are some attempts to widen the story with added characters on new school year or shining a light on one of the side character's love life but they all fall short. I overlooked this because of the allure of the main characters and the story. Both mains are really lovable and the author does a really great job at conveying their feelings to readers through the art. Story doesn't keep you at the edge of your seat but its it's exciting enough to make you wanna read the next chapter after you finish the last. Although story development feels a little bit slow here and there, it's never dull. It's that way only because of the main character's personality and I think more appropriate as the nickname "grandpa" suggests he is an old-fashioned guy. Time progresses more quickly during these periods so they don't prolong too much. The length of the manga is just right, no rushed ending or forced story development to squeeze out couple more volumes.

Overall, it's a really enjoyable manga but nudity makes it hard to recommend it to everyone. If you're fine with nudity, you should definitely check this out.

P.S.: I'm not really good with words and writing reviews but I do it because I love mangas and animes so any negative or positive feedback that help me improve myself is much appreciated.