If you're looking for anime similar to My Life as a Loser, you might like these titles.
Two middle school girls, Mii and Yuko, are visiting Hiroshima when they are transported back in time to World War II. The schoolgirls not only see efforts of Junod in Hiroshima firsthand, but also his efforts to improve the conditions of prisoners of war.
When a giant robot suddenly attacks the city, a high-school student named Aoba is saved by a classmate who’s piloting her own mecha. After accepting an offer to join the alliance she's is a part of, Aoba is thrust into the middle of high-flying robot warfare!
Hina comes aboard the Cygnus with Aoba and Dio, and she must decide where her allegiances lie. Meanwhile, her former comrades return home to Zogilia to find a shocking turn of events.
One blazing hot day a young boy named Yuta visits the Hotarugaoka Dam, a place where his father passed away, and encounters a strange old man. Yuta helps the old man by giving him something to drink, and later that day the man repays his kindness by saving the boy and taking him to the past, one month before the area becomes unoccupied for the construction of the dam. Unaware of why he is there, Yuta meets Saeko, a girl who loves fireflies.